Silicone plugs are ideal for powder Coating.E-Coating.plating Anodizing. Silicone plugs are ideal for powder Coating.E-Coating.plating Anodizing.Feature:1 Reusable,durable2 Temperature up to 250 centigrade3 Available in a wide range of sizes4 Available colors are: Clear, White,Blue,Yellow, Green, Black, Purple, Pink. Red,Orange,Grey, and so on.5 Available hardness: SHOR A, 40,50,60,70 duro.