Harken Black Magic® Air Blocks are strong and lightweight featuring free-rolling, high-load Torlon® roller bearings for a high strength-to-weight ratio and reduced wear. Rollers are housed in a center cage and stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion.
Use them for sail controls that see lots of action such as mainsheets, runners, halyards, and spinnaker systems on offshore boats.
Black Magic® Air Blocks are easy to clean and service with few parts and no loose balls or rollers to misplace. Unlike blocks that are riveted, fasteners allow quick disassembly with a single hex wrench.