This air cylinder block is designed for use with SX85 models from 2013 to 2017, TC85 models from 2014 to 2017, and XN85 engines.The component features an aluminum construction with a nickel external coating and an internal ceramic layer.It functions as part of the engine system where fuel and air mixture combustion drives piston movement to generate mechanical power.The part corresponds to OEM number 47130038000 and has dimensions of 97x47mm with a weight of 818g.This item includes one cylinder block.Please verify compatibility with your specific motorcycle model, year, and engine type before purchase.Installation instructions are not included.