18
Flying Fifteen © Rafael Benitez
These smooth-running powerful performers make 
trimming easy, no matter how hard the wind blows. 
Carbo Air blocks are made of tough reinforced 
composite in a size and style to fit any system: 
singles, doubles, triples, quads, and quints; ratchets 
and fiddles; soft and hard attach; 18 - 75 mm. Perfect 
for main, jib and spinnaker sheets on dinghies and 
sportboats; control lines on boats of all sizes.
Low-friction efficiency for fast 
trim and release
• Free-running ball bearings roll on 
 curved races, efficiently dispersing 
 load for a higher strength block.
High-strength, lightweight
• Lightweight, strong and reliable fiber-reinforced 
 composite construction.
• Open Air block design eliminates unnecessary material 
 to reduce weight.
Stands up to sun, salt, and time
• Ball bearings, sheave, and sideplates are UV-stabilized.
DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.
Carbo composite: 
Sideplates, sheave
Delrin® 
acetal resin, 
UV-stabilized:
Ball bearings
Materials
For properties 
see pages 
253-254.
CARBO AIR BLOCKS
Shackle blocks lock in two directions or swivel to keep 
line from twisting
• Cam-Lock or U-Lock allows shackle to be fixed or to swivel.
Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.
Cam-Lock
U-Lock
Which Block 
Do I Need?

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