The MuscleDriver USA 3-in-1 plyobox offers three sizes of plyo boxes for the price of one. This plyo box is solid on all 6 sides and is 20" x 24" x 30". This plyo box is extremely sturdy on each side and the exterior of box is sanded completely to avoid any sharp edges. Each box is sprayed with two coats of poly to protect the exterior wood. Ships fully assembled.