<E♭ Soprano Cornet Mouthpiece> Model with a Warm, Rich Tone This model is well-suited for E♭ soprano cornets, inheriting the cup shape of the BB-66D4, and is characterized by its warm and rich tone produced from a new shape. Rim Inner Diameter: 31.8 mm Rim Contour: Semi-flat Cup Depth: Slightly deep Throat: 8.87 mm Backbore: Slightly wide This is a new series developed by Yamaha for British-style brass bands. It adopts specifications close to the orthodox Denis Wick, clearly showing a strong consideration for brass bands. Yamaha has put unprecedented effort into this series, incorporating a classic design, pursuing an optimal weight balance with a dedicated blank, and featuring an original design with a slightly flat rim. Furthermore, the biggest feature is the "Neo™ Specialized Heat Treatment," which adjusts the metal composition for each part of the mouthpiece. This provides a significant change in tone and playing feel compared to previous mouthpieces. While not an adjustment or stress-relieving process, this process of changing the metal composition itself is only performed by a few workshops like BrassLab.MOMO and Monette. However, it is unprecedented to perform this process at this price and scale, attracting significant attention. After purchasing new, I have test-played it twice. The tone feels similar to the Tuba-Saders model mouthpiece. It seems I personally don't prefer heat-treated mouthpieces. I hope someone who finds it suitable will play it.