S.E. Shires New Classic 3/4 XD Silver Plated SP, Large Bore Bass Trombone ★ Cup Inner Diameter: 29.3mm ★ Throat Diameter: 8.3mm ★ Cup Depth: Extra Deep ★ Purchased new, used only a few times, in excellent condition. The New Classic model has a slightly medium-heavy body shape compared to the current Vintage series. The sound is well-balanced across a wide range, with a powerful tone. It combines a light playing feel with excellent control, making it a modern American type. The 3/4 XD has a large-diameter, deep cup, which is effective in the dynamic low range. The high range requires skill, but you don't feel as heavy a playing sensation as the appearance suggests across the entire range.