This pad protects your bike derailleur during a fall and transportation. It also protects your derailleur when another cyclist hits your rear wheel. It is made from low weight aluminium and weighs just 28g. The high quality anodised finish prevents the pad from scratches and wear. There are two types: a long and a short version. Both versions are suitable for a M5 rear axle. The long version is suitable for Campagnolo, SRAM and older types of Shimano (before 2018). The short version is suitable for the newest Shimano groups (from 2018).