Phosphor bronze sheaves are the more expensive, but are desirable where the blocks are exposed to corrosion, as in boats' falls and engineers' tackles, or where sparking may be dangerous, as in ammunition hoists.
Ibronzi yentsimbi zivela ekudlekeni njengenqanawa 'ukuwa nejineli zentambo zesikhephe okanye apho inkazimlo ingayingozi njengakwisingxobo sembumbulu.