Color Multicolor Packaging Type Box Material Silicone I Deal In New Only Silicone Rubber Cord and Silicone Rubber Rod made from a 70 durometer silicone. Commonly used for O-Rings but is used widely in many other applications. Silicone rubber rods have outstanding ability to be resilient against harsh chemical and industrial chemicals. The Silicone cords material is also used in seal applications with the ability to withstand environmental extremes without the impending issues of thermal cycling causing the seals to break.