TANDEM SPEED PETZL® double pulley is the fastest of the double pulleys. Specially designed for low angle zip lines. It offers good performance thanks to aluminum pulleys fitted with self-lubricating bearings. The attachment point can accommodate up to three carabiners for easy manoeuvring. Made of aluminum plates and aluminum pulleys and stainless steel shafts. Maximum authorized speed: 20 m/s, rope diameter max. 13 mm and a pulley diameter of 27.5 mm.