[Knowledge That Only Experts Know] The contact shrapnel is made of high-elastic, high-conductivity copper. After 10000 times plug & unplug test, the shrapnel contact resistance is still less than 15m, this is very important for charging cables. Did you know that inferior shrapnel can cause too much contact resistance, so that the socket will too hot & damage the socket of phone, and the phone can no longer be charged. [Fast & Durable] Powered by quality tinned copper conductors. Measured loop resistance less than 280mvoltage drop less than 0.6V when current is 2.4A. 15000+Bend Tested Set of these USB Type C cables. Lifespan 10x longer than other USB C Charging Cords. Premium TPE and nylon braided, surviving high pressure & extreme temperatures without cracking. 56kohm pull up resistance inside. [Seamless End Tip & Precise Interface] Integral Seamless stretch process, high pressure resistance. Aluminum alloy shell by micro-arc oxidation process makes the shell surface harder