Our Dynamic range is generally the best choice for applications that require constant sheave movement. Fixed Hook - A built-in hook to make attachment quick and easy. The hook can articulate, so it's ideal for outhaul and Cunningham systems. Bearings – Dynamic Blocks feature our patented bearing system which uses twin rows of stainless-steel ball bearings running on a stainless-steel rail. This provides a superior load-carrying ability and longevity when compared to other bearing systems which run on a plastic rail. Becket – Our 20 30mm blocks offer a large central rivet which not only reduces the overall weight but also offers a rope friendly attachment, perfect as a tie-off point when being used in a cascade system.