1. type: valve oil seal, wiht one or two spring 2. many models: CG125, JH70, GY6,AX100,etc GoodsValve ... .Oil seal MaterialNBR, FKM, etc.Spring materialStainless steelSpring numberOne or two pieces as per yours requirementOEM serviceAvailableFeaturesGood sealing, durablePackingbag, blister card , or ...