The Jupiter JHR-952RL F/Bb French Horn is a full professional double instrument. Positive action stainless bearing mechanical rotor linkage, rose brass mouthpipe and bell and engraved rotors. The bell is hand hammered rose brass - 302mm (11.9") diameter. The bore is 12.00mm (0.472") diameter. Comes complete with all manufacturer's accessories including wood frame case, mouthpiece, lacquer cloth and rotor valve oil.