Take your yoga practice to the next level with this unique Copper Nails Sadhu Board! Made of 100% oak, it's perfect for meditation and standing on nails. Something from chemistry lessons: Copper nails do not rust, by the way, just like the galvanized ones. From physics: copper is an ideal conductor, not only of current, but also of negative energy accumulated in the body, so during the Sadhu board practice on copper nails, you can get rid of negative energy. After the practice of meditation on copper nails, you get a strong psyche, gain inner peace, get rid of tension in the body, and become more self-confident. Eco materials: Natural oak, copper nails, oil-wax. Size: 12.6in*5.5in*1.4in (32cm x 14cm x 3,5cm). Nail size: 11.4in*4.7in (29 cm x 12 cm). Up to 45 foot size. Weight: 3.3lb (1.5 kg)