X3M FLIGHT is best block for intense uses, primarily designed for ocean race boats
It works according to the “center load keeping” principle, and is made of aluminum and titanium or aluminum and stainless.
The aluminum pulley can rotate with very low friction and is resistant to high static and dynamics loads thanks to the special polymer bearing installed. Small dimensions allow to have a very high ratio weight, pulley diameter and max working load. Easy and quick fixing is guaranteed from unidirectional Dyneema loop.
A Stretch fixed to a polymer body works as security system for fixing. X3M FLIGHT blocks are
available also in the SNATCH version with opening body and 2 pulleys