- Pulley shackle locks in two directions or swivels to keep rope from twisting.
- Center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Captive Delrin® ball bearings carry side loads.
- The low-load Black Magic pulley has red isolators. It uses Torlon® roller bearings and a 316 stainless steel headpost. Standard Black Magic pulleys have 17-4 PH stainless headposts.