It creates a lightweight

Two thirds the size of the old model

Soft touch for comfortable next-to-skin contact

Zircon blocks are available in 40- and 57-mm sheaves in single and double blocks

Hole spacing c-c 27 mm

Harken 57 mm Zircon Block 2195 SMALL KEEL BOAT Friction Rings It creates a lightweightZircon blocks help trimmers match sail shapes to new conditions immediately. At the core of the Zircon performance are industrial ceramic ball bearings mounted inside caged races. The cages keep these bearings separated so they dont bunch, touch, and stop each other. The result is the most efficient small boat block Harken has ever made. Zircon blocks are available in 40 and 57 mm sheaves in single and double blocks, with or without beckets. Sheave