Selling to organize equipment. This is a prototype cello endpin I recently purchased on Mercari. It produces a brilliant and powerful tone, making it a joy to play. There are some stains, possibly from heat treatment, and slight rust near the gold ring at the tip, but I will polish it as much as possible before shipping. The tone and volume are the same as when I purchased it. Below are the manufacturer's details: ■ Product Contents Cello Natural Model 10mm 50cm ・Made of special steel that is strong and tough, making the tip significantly more resistant to wear compared to stainless steel or titanium endpins. 〈Performance〉 From the characteristics of the natural model, it has power, overtones, and thickness. I first tried this performance model, and I completely fell in love with the sound of this endpin. The thickness of the A string, the clarity in high positions, and the dense sound during double stops are overwhelming. It gives the impression that the instrument's rank has increased several levels; that's the characteristic of this endpin.