Agility Gear 22 inch Wobble Board A wonderful balancing, core strengthening and confidence building tool for Agility and day-to-day life The Wobble Board is fully assembled upon arrival. It measures 22" in diameter and wobbles at a height of 3+". Durable Construction: Computer cut and routed ( rounded edges for safety ) cabinet grade plywood. Silica sand is infused into the outdoor flat paint for traction. This Wobble Board has been "Performance Tested" by small, medium & large breed dogs.