soft colored silicone sealing ring 1.100% silicone,extremly durable 2.color ... 3.SGS FDA LFGB available soft colored silicone sealing ring Material100% silicone sealing ring, soft, comfortable, eco-friendly, harmless ... be healthy and working well.ApplicationRailcars,automobile,steamboat,industrial electrical equipment,building door& window, construction machinery,construction bridge and tunnel ...