Petzl Tandem Cable Pulley INTENDED USE: The TANDEM pulley is designed for smooth and efficient Tyrolean traverses on rope. CONSTRUCTION: The sheaves mounted on self-lubricating bushings offer good efficiency. EASY TO USE: The TANDEM's attachment point accepts up to 3 carabiners to facilitate use. SPEED: The maximum speed allowed on the TANDEM pulley is 10 meters per second. DETAILS: The TANDEM weighs 195 grams. It has a working load of 10 kN and a breaking strength of 24 kN. It accepts ropes up to 13 mm in diameter.