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Harken Blocks - Black Magic Blocks (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.
MAURIPRO Sailing, your direct access to Harken 57 mm Black Magic Blocks and all your other sailing and boating needs.