silicone rubber plug 1.1.Fast delivery,best after-sale service. 2.Soft&Durable&Eco-friend,Water-proof. 3.Customized. customized silicone rubber plug Itemsilicone rubber plugHardness5~90 Shore A FeaturesHigh and low temperature resistance, oil resistance, anti-ozone and aging,wearable,great flexibility,harmless, nontoxic, non-radiation, high flexibility, comfortable, sound absorbing, anti-skid, ...