- 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 Delrin® rollers, with a 17-4 PH stainless headpost and 316 stainless steel shackle.