Our most popular TESA pulley. It is light-weight and equipped with high strength alloy steel., aluminum body. The stainless steel ball-bearing speed pulley is a great choice for a variety of industrial and sports applications. It features aluminum side plates with smooth rounded edges and sealed stainless steel ball bearings for more efficient performance and dual pulley stability. It is designed for cable or rope. Large hole for ease of carabiner attachment. High efficiency, 20 m/s.