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The Petzl Tandem Speed Pulley is a climbing pulley for lower-angle tyrolean traverses. The Tandem Speed Pulley uses stainless steel sheaves for durability. The fastest transport pulley by Petzl, at a maximum allowed speed of 20 m/s. ZOOM! The sheaves are mounted on sealed ball bearings for sustained speed. The pulley is capable of transport via rope or cable and can attach up to three carabiners. Enjoy sending yourself (or a buddy) across to the other side.