This is from the early days when Ishimori Gakki first started selling pure silver screws. It's a set for the neck and lyre, both made of pure silver. Recommended for those seeking a faster response and a change in resonance. Size is for Selmer (also usable on Yanagisawa). There are minor signs of use due to age, but there is no damage that would hinder use. Perfect for those considering a sound upgrade or looking for parts from the early Wood Stone era.