This Stronglight Dural 5083 Inner Chainring is made from machined 5083 Alloy and is designed for Shimano chainsets with a 5-bolt 130mm fitting. It is compatible with Shimano 9 and 10-speed drivetrains. The chainring has 42 teeth and a 130mm BCD. This high-quality chainring is suitable for use with Campagnolo or SRAM drivetrains as well. Please note that the image provided is for illustration purposes; you are purchasing the size listed above.