High quality exhaust gasket, which is reinforced by aluminum and perfectly seal well. The 5 mm thick exhaust gasket is expressed during installation is minimal, so that a 100% seal is guaranteed. Dimensions: inner diameter: approx. 29 mm. Outer diameter: approx. 36 mm, height / thickness: approx. 5mm Important: Compatible with the models listed in the article Name with 50cc 2-stroke engine. Please compare the safety graphics/dimensions with originals.