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© Danielle Chandler
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. Offered 
in 45 – 150 mm sizes, with low-load 
versions in 57 and 75 mm ranges.
Caged vs. Uncaged Rollers
Low-friction efficiency for fast trim and 
release
• Center cage keeps Torlon
® roller bearings 
 separated and parallel to reduce friction.
• Captive Delrin® ball bearings carry side loads.
High-strength, lightweight
• Aluminum sheaves and sideplates. 
• CNC sculpted for optimal strength-to-weight.
Stands up to sun, salt, and time
• Sideplates and sheaves Hard Lube-anodized for 
 maximum UV protection and a smooth surface. 
• Dissimilar metals isolated to prevent corrosion.
BLACK MAGIC AIR BLOCKS
DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.

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