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.

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, strong and reliable...

Harken Carbo Block 75mm Single Cheek Ratchamatics*1.0

Harken Carbo Block 57mm Single Swivel Ratchamatic 1.0

Harken Carbo 57mm Single Ratchamatic Swivel Block 15:1

Harken Carbo Block 57mm Single Swivel Ratchamatic*2.0

Harken Carbo Block 57mm Single Swivel Ratchamatic*2.0 HTE

Harken Carbo 57mm Single Ratchamatic Swivel Block *1.5 HTE

Harken Carbo Block 57mm Single Swivel Ratchamatic *1.0 HTE

Ronstan Block 30mm Single Swivel

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the...

Harken Carbo Block 57mm Single Swivel Ratchamatic 1.0