Size: 3-40.5mm(If you wish other sizes or colors, please contact us!)Material: Silicone rubber Color: Black Hardness: 50 ° Temperature resistance: -40 °~+250 °Features: 1. Made of wonderful silicone, with nice toughness, elasticity, safety, environmental protection, and hot temperature resistance. 2. The product has no odor, is proof against extreme temperature and corrosion, and is made from insulating materials.