Harken 40mm Carbo Triple Block with Swivel Shackle Head Tracking_Boardfy while the internal silicone grippers

while the internal silicone grippers keeps it in place while you move

under the small lip

1mm hole for secure rudder attachment

ensuring friction stays as low as possible whilst still guiding the rope to where it needs to go

90% Neoprene / 10% Nylon

Harken 40mm Carbo Triple Block with Swivel Shackle Head Tracking_Boardfy while the internal silicone grippersLow friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Sheave 40 mm Length 94 mm Weight 118 g Shackle Pin 5 mm Maximum Line 10 mm Maximum Working Load 660 kg Breaking Load 1383 kg