Harken Carbo Air Block w/Cam Cleat & Becket 40mm. These Carbo Air Blocks from Harken have very high working loads for safe easy trimming. The Harken Carbo Air Light Weight Trimming Blocks feature low-friction running gear to protect the boat's finish. The carbo air 40mm block is a proven high-performance product with a classic proven design and the best price/performance ratio of any dedicated Carbo Air block/becket combination. The Harken Carbo Air Light Weight Trimming Blocks combine all the key performance characteristics of a high-load block with the low-friction running gear of a Black Magic type block. In addition to the obvious superiority of the Black Magic blocks the Carbo Air blocks also have the unique ability to self-separate at elevated temperatures prolonging the life of the block. Specifications for Harken 40mm Carbo Air Block w/Cam Cleat & Becket: Manufacturer: Harken Color: Black Package Contents: Harken 40mm Carbo Air Block w/Cam Cleat & Becket Harken 2646: Carbo Air Block w/Cam Cleat & Becket 40mm