Available for Rental/Purchase. Newly designed, highly polished bore The new bore design which incorporates vertical integration is similar to that of the YOB-841 professional model. This results in improved projection and improved tonal qualities. Newly designed undercut tone hole design Also similar to the YOB-841, the new taper to the tone hole design provides the player with a smooth response and even intonation. Nickel-silver bell ring The bell ring increases effective density of the bell for a quicker response and a more focused sound. French taper pivot screws French taper pivot screws are designed for precise adjustment and increased longevity. Stainless steel springs Durability, key balance and a more comfortable feel are all benefits of using stainless steel as the spring material.