Petzl Tandem Speed Trolley One Size P21 SPE. Specifications for Petzl Tandem Speed Trolley: Manufacturer: Petzl Fabric/Material: Stainless Steel Weight: 9.5 oz Breaking Strength: 24 kN Rope Capacity: For use on cable (maximum diameter of 12 mm) and on rope (maximum diameter of 13 mm) Working Load Weight: 10 kN Pulley Type: Transport Features of Petzl Tandem Speed Trolley Stainless steel sheaves for excellent durability Sheave mounted on sealed ball bearings for excellent efficiency Accepts up to three carabiners to facilitate use Package Contents: Petzl Tandem Speed Trolley Petzl P21 SPE: Tandem Speed Trolley One Size