ABS resin, 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. Key System Simplified conservatoire, Bore Style American, Octave Keys Semiautomatic, Mechanical Features Covered keys, Upper joint material ABS resin, Lower joint material ABS resin, Bell Material ABS resin, Key Material Nickel silver, Plating Silver, Tone Holes Undercut, Thumb Rest Fixed, Trill Keys C#-D#; F#-G#; A#-B; B-C#; C-D, Spring Type Stainless steel
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