Roller Bearing Blocks

Selden and Harken

Low resistance at high, dynamic loads is the main characteristic of Seldén Roller Bearing Blocks (RBB) and Harken Black Magic Blocks.
The ability to easily release a highly loaded backstay tackle, a main sheet, a spinnaker halyard or a kicker tackle makes for fast, safe and uncomplicated manoeuvres.
Designed for high load, dynamic applications.