This is a high-quality rear cylinder with a standard bore of 97mm, compatible with 2004-2008 Aprilla RSV2 1000R and RSV1 1000R ROTAX models. The material used in the manufacturing is aluminum, and the color is silver. It is designed for street bikes and is ideal for enhancing the performance of your motorcycle. The cylinder is in excellent condition and will undoubtedly satisfy your requirements. It is compatible with models from 2004 to 2009. The manufacturer part number is bjr#2509. cylinder walls are in good condition