This is a tenor horn mouthpiece from Romera Brass, a Spanish mouthpiece maker. * Tenor horn (alto horn) mouthpiece * Anthony Galinier signature model * Inner diameter: 18.5mm * Throat: 5.20mm * Depth: 24.3mm I think this is a very responsive and easy-to-use mouthpiece. There are some scratches from use, but it has not been dropped and is in good condition.