Ronstan 45 mm Sheave - Nylatron, RF132 Sailboat Blocks & Hardware_100 mm Aluminum Black Magic Loop Block Patent-pending Harken Reflex furlers provide

Patent-pending Harken Reflex furlers provide sailors confidence that their free-flying spinnakers and gennakers will furl with speed and control

Featuring Black Magic palm material

Cars feature car-mounted

The flush-fit becket pin head is kind on deck surfaces and won’t snag lines

They have few parts and no loose balls or rollers to misplace

Ronstan 45 mm Sheave - Nylatron, RF132 Sailboat Blocks & Hardware_100 mm Aluminum Black Magic Loop Block Patent-pending Harken Reflex furlers provideThese sheaves are made from a unique plastic material which is suitable for use with wire. Nylatron is a cast, partially cross linked polyamide compound which has been modified with a MoS2 filler.