Black Magic air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. The sheave center carries primary load, allowing a smaller, lighter weight block. The soft-attachment loop block has a removable deadend post for attachment to a padeye. Lashings can also be used.Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.SpecificationsSheave diameter: 2 1/4″ (57 mm)Maximum line diameter: 7/16″ (12 mm)Maximum working load: 2500 lb (1134 kg)Breaking load: 5000 lb (2268 kg)Length: 3″ (76 mm)Weight: 3.23 oz. (92 g)Spare Parts1. AL-3238 – Dead End Post2. AL-3700 – Alpha Cheek3. AL-3701 – Beta Cheek4. H-34389A – Sheave AssM.5. HBB85 – Roller Cage Assm.6. HFS796 – FST. 4 X .7 X 12MM SHCSTechnical FileInstruction Manual .input-wrapper a { text-decoration: none; / Removes underline / background-color: transparent; / Ensures no background color / } .input-wrapper a:hover { text-decoration: underline; / Adds underline on hover / background-color: transparent !important; / Removes grey highlight / }