Petzl’s TANDEM CABLE is a double pulley for use with ropes and cables. It’s designed for smooth and efficient Tyrolean traverses on rope. Stainless steel sheaves provide excellent durability. They are mounted on self-lubricating bushings for good efficiency. The maximum allowable speed is 10 m per second. The attachment point accepts up to three carabiners to facilitate use. The TANDEM CABLE is designed for use on cable with a maximum diameter of 12 mm and on rope with a maximum diameter of 13 mm.