How to Choose a Sadhu Board: 8, 10 or 12 mm, Aluminum or Copper
Short answer: if this is your first board, choose 8 mm nail spacing. If you have stood on nails before, choose 10 mm — it is what most practitioners settle on. Choose 12 mm only if 10 mm has become comfortable. Aluminum and copper nails feel nearly identical at the same spacing; copper costs more because of the material, not because it is more intense.
Nail spacing is the only thing that changes the intensity
Nail spacing is the distance between the tips of two neighbouring nails. It is not the thickness of the board and it is not the length of the nails. The closer the nails sit, the more of them are under your foot, so your body weight is spread across more contact points and each individual point presses less. That is why smaller spacing is gentler.
| Spacing | Level | How it feels | Choose it if |
|---|---|---|---|
| 8 mm (0.31 in) | Beginner | The gentlest. Sharp at first, but pressure is well distributed and most people can stand within a few tries. | This is your first Sadhu board, or you have low pain tolerance. |
| 10 mm (0.39 in) | Most popular | Noticeably more intense. Clear acupressure sensation, still reachable after a few weeks of practice. | You have stood on nails before, or you want one board to grow into. |
| 12 mm (0.47 in) | Advanced | Fewest contact points, strongest sensation. Demanding from the first second. | 10 mm has become comfortable and you want a new edge. |
If you are between two options, take the smaller spacing. A board you actually stand on every day beats a board that is too intense to use.
Aluminum or copper nails?
At identical spacing the physical sensation is very close. The difference is material properties, weight and price.
| Aluminum nails | Copper nails | |
|---|---|---|
| Feel | Stays cool to the touch longer | Warms to body temperature faster, which many people find more comfortable |
| Weight | Lighter — around 575 g (1.26 lb) | Heavier — around 670 g (1.47 lb) |
| Hygiene | Corrosion-resistant | Naturally antimicrobial |
| Look | Silver, understated | Warm metallic, develops a patina over time |
| Price at Tengry | From $69.90 | From $79.90 |
| Best for | Travel, first board, best value | Daily home practice, gifts, those who want the traditional material |
Copper is traditionally associated with grounding and energy flow in Eastern wellness practice. That is a traditional attribution rather than a clinical claim — choose copper because you like the material and the way it warms up, not because it will change the physical effect of the nails.
What every TENGRY board has in common
- Base: ECO birch plywood with a 3-layer glossy varnish
- Nail pattern: Hexagon / Flower of Life — nails spaced equally in every direction, so pressure spreads evenly instead of concentrating in lines
- Format: two separate boards, one per foot, that interlock for storage
- Size: about 32 × 12–13 × 2.3–2.5 cm (12.6 × 4.7–5.1 × 0.9–1.0 in) per board
- Max foot size: roughly US M12–13 / EU 46–47 / UK 11–12
- In the box: the boards, a velvet storage case, aroma sticks with a holder, and a gift-ready box
- Shipping and returns: free worldwide shipping and a 30-day return window
Which board should I buy?
- First board, best value — Aluminum 8 mm, $69.90
- First board, premium material — Copper 8 mm, $89.90
- The one most people end up with — Aluminum 10 mm, $69.90
- A gift that looks like a gift — Copper 10 mm, Lotus Flower White, $79.90
- Ready for the next level — Aluminum 12 mm, $69.90
See all available Sadhu boards →
How to start
- Put the boards on a stable, non-slip surface, close to a wall or a chair you can hold.
- Stand in socks for your first sessions — it takes the edge off without changing the practice.
- Step down with your weight on your heels first, then lower the rest of the foot evenly. Never jump on.
- Start with 10–30 seconds. Breathe slowly and deeply; holding your breath is what makes it unbearable.
- Add a little time each day. Most people reach 1–3 minutes barefoot within a few weeks.
- Step off the same way you stepped on, and walk around for a minute afterwards.
Frequently asked questions
What is a Sadhu board?
A Sadhu board is a wooden board with evenly spaced metal nails that you stand on barefoot. It comes from ascetic practices in India, where standing on nails was used as a discipline for the mind. Today it is used for standing meditation, acupressure foot stimulation, breath work and building tolerance to discomfort.
Which nail spacing should a beginner choose?
8 mm. The nails sit closest together, so your weight is spread across the most contact points and the pressure at each point is lowest. Almost everyone can stand on 8 mm on their first day, at least in socks.
Does standing on a Sadhu board hurt?
The first seconds are intense and it is normal to want to step off. The sensation usually changes to warmth and tingling once you settle your breathing. It should never be a sharp, stabbing pain — if it is, the nails are taking your weight unevenly, so step off and reposition.
How long should I stand on a Sadhu board?
Start with 10–30 seconds and add time gradually. One to three minutes is a normal daily practice. Longer sessions are not automatically better — consistency matters more than duration.
Can I use a Sadhu board with socks?
Yes, and it is the recommended way to start. Socks spread the pressure slightly and make the first sessions much easier. Move to barefoot when standing in socks stops being challenging.
Aluminum or copper nails — does it change the sensation?
Barely. At the same nail spacing, the pressure on your foot is essentially the same. Copper warms up to body temperature faster and is naturally antimicrobial; aluminum is lighter and less expensive.
What is the board made of?
ECO birch plywood with a three-layer glossy varnish, with aluminum or copper nails set in a Hexagon / Flower of Life pattern.
Is a Sadhu board safe?
For a healthy adult standing correctly on a stable surface, yes — the nails are blunt-tipped and spaced so they do not pierce the skin. Do not use one if you have diabetic neuropathy or reduced sensation in your feet, open wounds, infections or fungal conditions on the soles, circulatory disorders, or if you are pregnant, without speaking to a doctor first. Children should only use one under adult supervision.
How do I clean the board?
Wipe the nails with a cloth and a little alcohol after use and let it dry. Do not soak the board or leave it in a damp room — the plywood base is varnished, not waterproof.
Do you ship worldwide, and can I return it?
Yes. Shipping is free worldwide, orders are dispatched within 1–6 business days and typically arrive within 7–14 days. You have 30 days from delivery to request a return.