The MuscleDriver USA 3-in-1 plyobox offers three sizes of plyo boxes for the price of one and is the perfect box for the scaled athlete. This plyo box is solid on all 6 sides and is 16" x 18" x 20". 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.