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; soft and hard attach. Perfect for main, jib and spinnaker sheets on dinghies and sportboats; control lines on boats of all sizes. Lightweight,...

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming

Harken Carbo 40mm Single Block Asymetric Kit

Harken Carbo Block 57mm Sextuple Becket Mainsheet Boom 12:1

Harken Carbo Block 57mm Sixtuple Swivel 12:1 System

Harken Carbo 57mm Sixtuple Ratchet for 12:1 system

Harken Zircon 40mm Catamaran Mainsheet System 12:1 Cam Cleat Purchase system not delivered with full length sheet!

Ronstan Block 40mm Quintuple Swivel 10:1 System 

Ronstan Block 40mm Quintuple Swivel Becket 10:1 System 

Harken Carbo Block 57mm Quad 2 Becket Swivel 12:1 System