This plate Stronglight Ergal Compact is a plate inside. These dishes benefit of the indexing CSA that gives them flexibility, speed and precision. It is equipped with 5 arms. It is compatible with the Shimano 9 and 10 speeds. Material: Aluminium 7075 T6 inner plate between centres: 110 mm Colour: Black Gear available: 34, 36, 38 or 40 Weight: 42 g (38)