A great purchase!
"These plyoboxes work great. The grip on the bottom holds well to the dojo mats, even when students are leaping from one box to the next. The stackability is also great! We purchased one of each size, and the students have enjoyed the jump training as well as the versatility in obstacle course activities. Last, with the solid foam structure, they don't give way under pressure, but also don't murder shins when you miss the jump."