These are Self-fusing silicone rubber tape manufactured by Ningguo BST Thermal Products Co which is made from a 100% high performance silicone elastomer. Its component on its silicone enables it to permanently bond to itself when being stretch or over-wrapped. For other features, it has nos residue and will never get gummy or sticky texture like electrical tape or duct tape. For its tensile strength, it has a rating of >4.9 Mpa (700 psi) and has a minimum elongation of >200%. On the other hand, its electrical strength is >20 Mv/m and can even function under temp of 180 ℃ (356 ℉). The unit can also withstand a temperature of 260 ℃ (500 ℉) and can still remain flexible to -30 ℃ (-85 ℉).