This is an X1 knee supporter. A set of two is also sold on a separate page, but there are several available, so the quantity can be changed according to your needs. Black L-size knee supporter, providing comfortable support. - Model Name: X1 Knee Supporter - Size: L - Color: Black - Application: Knee Supporter Although it is new and unused, it is stored by an individual, so please refrain from purchasing if you are nervous or seeking perfection. Please purchase with understanding. If you have any concerns, please consult in the comments before purchasing.