Product Specifications: Material: Wood; Weight: 21.2 oz (600 g); Size: 8.3 x 8.3 x 3.5 inches (21.2 x 21.2 x 9 cm); The more excitement the cats that respond to the movement of the ball, the more rapidly moving the ball, the more exciting it plays. Simple structure but sturdy and unbreakable wood. Non-slip, protects floors from scratches.