I have experimented with most endpins that are on the market, on three different instruments, and the conclusion is not very clear. What is clear, though, is that endpins can influence the sound and playability of a Cello. Some Cellos respond better with endpins that are heavier (e.g. Mitsuke Triple Brillante) and others with lighter ones. In general, 10mm thickness is the way to go, so that there is no wobbling while playing. The best endpin that I discovered for my instruments is made of Titanium and is hollow. It has the best combination of projection and core. There is only a small problem though… it’s custom made and not available on the market.