Grivel carabiners are forged using 7000-series aluminium, the same alloy & forging process as they use for their ice axe shafts, as it offers an excellent balance between light weight, breaking strength & durability. Each one is individually strength tested & has its individual test number laser etched onto it. The Gamma Quickdraw features a pair of superlight Gamma wiregate biners at either end of a dyneema sling, ideal for trad & ice: strong, low weight & no danger of a frozen gate.