Sheaves run on Torlon rollers with dual Delrin ball side thrust races. Alloy sheaves, alloy bayonet cheeks for simple servicing. Safe working load are quoted for the whole assembly, the upper sheave should not be loaded beyond 60% of the safe working load.
New Second Generation racing blocks features:
Newer lighter form with smoother edges
Uses standard, off the shelf fixing bolts
Remove single screw in head to disassemble for servicing