If I was starting over and could only buy one thing, this would be it. But whether you buy this or build your own, I believe you can create and maintain knee ability in the upper 1% of society with this alone. Using an ATG Buddy for Reverse Step Ups and ATG Split Squats adds further layers of ankle and hip development (as well as balanced strength between sides), but nothing replaces a Slantboard for knee-building squats! Product Details: 100% American Made Comes fully assembled and ready to use 25-degree angle All corners and edges are gently rounded Custom ATG USA logo, non-slip surface, and an easy-carry handle Product Material: Made from 18mm 11 ply birch wood. Product Dimensions: Width: 19 1/2 inches  Length: 13 1/4 inches  Height: 5 7/8 inches Weight Capacity:  500 lbs