VX - ORGANIC FOR THE ENTHUSIAST: 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.VRX - SINTERED FOR TRAIL, COMPETITION & DOWNHILLING: With increased Carbon content sintered pads are designed to deliver maximum performance under extreme conditions and during sustained riding. Recommended for use with Hydraulic Systems.VRS - ELITE FOR COMPETITION: Kevlar Competition Use Reinforced to increase the frictional properties. Ceramic properties to improve co efficiency in the wet. Copper to maintain braking characteristics at low and high speeds. Back plate Design improves heat dissipation and weight reduction. As a result durability is improved and gives over 35% better performance than a standard pad.  Compatible: Avid Elixir 1, 3, 5, 7, Elixir R, Elixir CR, SRAM XX, X0