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The Prism is a stripped down racing compass
and Aluminum cheeks and Delrin (tm) ball bearing sheaves (506 series)
Harken 57mm ESP Forkhead Block with a high-strength axle for high static loads
Harken 29mm Carbo Air® 90° Fixed-Head Single Block allows a 2:1 or 3:1 purchase system
The 484 features a bronze sheave for added durability
HARKEN 125 mm Aluminum Black Magic Block - Swivel, 3256 Sailboat Blocks & Hardware_40 mm Utility Fiddle Block - Becket The Prism is a strippedBlack 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 the primary load, allowing a smaller, lighter weight block. The soft attachment Loop block has a
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