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16mm AirBlocks offer very high working loads in an extremely small, lightweight block. These diminutive blocks feature a patented bearing system using stainless balls in a captive, grooved race and provide an honest 250lbs (113kg) safe working load. They are perfect for the new, smaller synthetic control lines found on high-tech dinghies and are the obvious choice for competitive racers. The 404 uses an O-ring to keep the line in the sheave during intermittent loading.