The Petzl Tandem Pulley is a double pulley for transport along rope. Whether you're making your way over a swift river or a dangerous and steep scree field, the pulley makes for a smooth Tyrolean traverse. The sheaves Are mounted on self-lubricating bushings and support a maximum rope diameter of 13mm. The attachment point allows for up to three carabiners with a breaking strength of 24kN. You may look like a sloth while pulling yourself from point A to point B, but you'll definitely be much speedier with the Tandem. Final SALE: For safety reasons, we cannot accept returns on load-bearing Climbing equipment. Sorry for being so mean. Features of the Petzl Tandem Pulley Aluminum sheaves mounted on self-lubricating bushings for efficiency Accepts up to three carabiners to facilitate use