HARKEN Ball bearing hook-in block creates an Optimist halyard system with less friction. Also works with the Laser clew and cunningham as a quickly releasable system. Go fast with Harken!! H391Price: $37.25Sale price: $32.95 WE SHIP WORLDWIDE! We charge the actual cost of shipping. You may email us for a shipping cost estimate. Send us email intensitysails(at sign)gmail.com US$10 MINIMUM ORDER