Harken Aluminum Loop Air Block - 57mm Captains Choice Minimizes stress on ALL lines—or

Minimizes stress on ALL lines—or use on any boat

Midrange Captive Ball Traveler Cars are built to handle high loads on boats from 27 ft to 34 ft (8 m to 10 m)

1/4-28 3" 4-1/2 1/4" 4

No-mess features

Harken Aluminum Loop Air Block - 57mm Captains Choice Minimizes stress on ALL lines—orHarken 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