Plyobox 12" 18" 24" Set of 3 Plyometric Training Workout Platform Plyo Box for Box Jumps Heavy Duty Welded Steel Construction Red Scratch Proof Power Coating Beefy 3/4 in Rubber Top to cushion landing and outlasts all other thin-top boxes on the market Heights: 12", 18", 24" Tops: 13" x 13", 15" x 15", 17" x 17" Bottoms: 17" x 17", 19" x 19", 21" x 21"