Delivery free Designed to condition the body with dynamic resistance exercises, the muscles are rapidly stretched and shortened through a series of jumping or hopping routines. Overtime doing just a few minutes every day will builds explosive power in the muscles and increases the speed nd agility with which the muscle reacts whilst also burning calories and boosting cardio endurance. Strong and sturdy this stunning set of 4 stackable boxes which come in the following height; 12”, 18”, 24” and 30” with maximum stability and steel construction with fully welded frames. 3/4" plywood landing pad with a 1/8" non-skid slip resistant rubber surface for increased grip. Usage : Commercial/Home Material :3/4" Plywood Landing Pad , Non Slip Textured Rubber Surface , Solid Steel Fully Welded Frames Includes : Set Of 4 Plyo Boxes Heights : 12" (31cm) 18" (46cm) 24" (62cm) 30" (77cm) Weights : 5kg 2kg 8kg 5kg Density : Hard Dimensions : Base: 38cm X 38cm - 59cm X 59cm Top: 33cm X 33cm - 41cm X 41cm High jumps with step downs Progressive height jumping Forward, lateral, and other plyometric jumping drills 19121369