These are wooden balancing stones or building blocks. The concept for these wooden stones originated in Japan; the name Tumi ishi is Japanese for piled stones. Stones are invidually hand made and vary in size, shape, and wood species including black walnut, maple, cherry, mahogany, and oak. We carefully sand each block and finish them with our own blend of food grade fractionated coconut oil and beeswax only. This set includes 12 Tumi Ishi wood blocks in a hand made wooden box made from clear maple and mahogany. If you have a preference for a single wood species, please include the request with the order or DM our shop.