Harken 125 mm Black Magic, AirBlock Stand-up Cat. No. HAR 3261 Weight 3.5 lbs
3018 125 mm Stand-up Block
125 mm AirBlocks® feature Torlon® rollers in a self-contained
cage. Rollers stay parallel for low-friction efficiency. UV-resistant,
carbon-black Delrin® balls carry sideloads.
Used on offshore boats, these blocks offer a no “climb-out” deep groove
sheave with radiused edges to protect line. Sculpted aluminum
sideplates and thin-profile sheaves make these blocks very lightweight.
No stainless-to-aluminum contact prevents corrosion.