1.ECO-friendly,water,air proofed,high temp resistance 2.Meet ROHS, REACH... 3.High QA/ ... .Excellent resistance of acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oil;SizeDifferent demensions of rubber ring are available ... equipment, skillful workmanship, rigorous quality control standards,attractive design and durability. They are well-known for excellent quality, most ...