Designed to offer a warmer, more inviting sound, the CSG possesses a smaller bore and hand tapered, undercut tone-holes. The tone is extremely rich yet focused and responds with amazing ease in all registers.Hamilton plating is an alloy of gold and nickel. It's extremely resistant to wear and discoloration, and delivers a powerful tone with excellent projection. On the CSGH instruments, the Hamilton Plating is actually not only on the keys, but on the posts as well. In artist testing, it was shown to be a dramatic difference between instruments that had just Hamilton plated keys and Hamilton plated keys and posts