If you use Z-SKINNY for a long time after purchasing, the knee pad will wear out and need to be replaced. For those who wish to purchase separately, buy 1+ get 1 free (2 pieces) just to be safe side.

The knee pad for Z-Skinny BASIC (ZS-B model) has one circle on the protective tape on the attachment side, and the pad for SWIVEL (ZS-W model) has two circles, so please carefully distinguish the difference between.