Aztec v type cartridge system brake blocks are replacement brake blocks for v type brakes featuring anodised aluminium alloy pad shoe and brake pad inserts held in securely by pins replacement pad inserts are available separately simply slide out and slide in pad replacement supplied complete with one set of alloy rim compatible pad inserts v type insert pads are made from aztecs finest braking compound offering you great braking power and durability even in the most adverse weather and tra