Harken Aluminum Loop Air Block - 57mm Manual Pumps Rope chain management by the

Rope chain management by the spring loaded arm

The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry

• Able crew can simply climb up the integral ladder rungs

10 dB extra sound attenuation compared with 2-chamber systems

Harken Aluminum Loop Air Block - 57mm Manual Pumps Rope chain management by theHarken Aluminum Loop Air Block 57mm 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