Ultimate Hardware Contrast Mountain Bike V Brake Blocks - Allen Key Fit (Pair) High quality V brake blocks are suitable for almost all V Brakes from all manufacturers 70mm in length and deep grooves to help with with heat dissipation. Rubber compound is hard wearing and has a wear line so you know when to replace Washers provide an easy fitting system that enables you to align the pad on the rim with 1 tool Approximate fitting time 10 mins per pair