These pads are meant to work with State Bicycle Co. 4130 All-Road bikes manufactured with the P romaxDSK-300R disc brakes . Please check your bike prior to buying to ensure the correct fit. Other brake caliper models will require different replacement pads. VX ORGANIC : Specifically designed to give the best performance under normal conditions. The organic compound gives improved noise reduction as well as increased ‘bite’ in general use. Recommended for use with Mechanical Systems. Risk-Free Purchase - State Bicycle Co. offers FREE EXCHANGES* -If this item doesn't work out, we'll send you a return label and exchange for free!