... is smooth and clean,2.The rough degree of the rubber surface is3.23.The metals an outward appearance noodles defends ... layer rubbers of G noodles with each other do not glue to connect6.The durable experiment(Z):Under the circumstance that ... ,CR13709,CFKM,BII610,BA6053,BII510,Silicone, chloronorgutta, CR chloronorgutta aviation rubber,foaming rubber, 08F,TPR, VMQ, NRAA712, H62Y2, PPO,abs,pp etc ...