Willie's YU TAMAKI Jewelry series is a new-concept mouthpiece that allows you to freely change the tone while maintaining the same blowing feel, realized through the ideas of Yu Tamaki. Crystal is a model that, as a result of adjustments to improve the response from Topaz, is said to produce a sound that is incomparably clearer than before. Rim Inner Diameter: 25.7mm Cup Depth: Medium Throat Diameter: 7.08mm For Large Shank There are minor scratches from use. I think the condition is good, but please refrain from purchasing if you are sensitive to used items. Thank you.