This is a motocross kit for Ossur's CTi knee brace. The kit includes: a patella cup, two gear guards, an undersleeve (size S), and a small sticker sheet per set. It can be used with both CTi OTS and CTi Custom. I purchased it through personal import from an overseas shop because it was expensive in Japan. It's practically unused, having only been tried on my knee brace once after purchase. The undersleeve is unused and unopened. All original accessories are included. It's a set of two, usable for either the left or right knee (there is no specific designation for left or right on the product itself).