Fusion Climb Unisex Tesa Speed Pulley Aluminum / Stainless Steel 1 Speed Pulley High strength alloy steel and aluminum body, High Efficiency: 20m/s, Aluminum side plates, Smooth rounded edges, Aealed stainless steel ball bearings Strength: MBS: 24 KN Rope size: &lt; 12mm" Cable Rope Dimensions: 4.24" x 3.14" x 1.08"