This is a set of two knee pads with built-in padding. The pads are inside. The length is approximately 21cm, unisex. The size is free size, but the applicable circumference around the kneecap is 32cm to 38cm. It is made of stretchy material, so it should fit most people. The materials are cotton, polyester, and polyurethane. There are two colors: white and black. If you would like a different color than the one in the photo, please purchase it as is and comment. We will ship the color you requested. Price is not negotiable. Also, although it is new and unused, it is an inexpensive product, so there may be some loose threads (although this is rare). Please understand this before purchasing. If you would like to purchase multiple sets, please comment, and we will offer a slight discount. Shipping will be via Yu-Yu Mercari Bin or Raku-Raku Mercari Bin with tracking. 1 set (2 pieces): 980 yen 2 sets (4 pieces): 1900 yen 3 sets (6 pieces): 2700 yen Thank you for your consideration. Knee support Supporter Knee supporter Knee supporter Volleyball Sports Pain