... multilayer plugs has a better seal and solid solidThe conical design allows for easy insertion or remove as a plug. Can be ... non-stick finish ,easy to clean ,durable,tastelessflexible,easy to remove and useful material :made of 100% food grade silicone(FDA,SGS ... colors(for example:clear,white,red,blue,pink,black and so on)and material are optional10.Silicone,Viton,Neoprene,Hypalon,plasticproductsPC, ...