Core Power all-in-one plyobox is soft but sturdy and takes less space than having 3 different plyo boxes. Stable, soft, and light, makes it user friendly and safe for all types of athletes. Just tilt it over and you change its height. Core Power all-in-one plyobox can be used in 3 different heights depending which side is tilted: 51 cm, 61 cm and 76 cm.