X ring is a kind of sealing ... air conditioning, etc.3. Main products: O-Ring.X Ring V-Ring.R-Ring. Y-Ring.U-Ring ... ROHS, SGS .5. Packing: neutral or as per client's requirement.6. Colour: red ,white,black ,blue ,yellow ... your requirement ,but o-ring's mold fee is freeCompany Name: Best Ring Technology Co. , Ltd. Business Type: Manufacturer Ownership ... Shore-A Hardness Tester, Optical Projector rubber x seal