Professional Craftsmanship The level of artistry and craftsmanship that goes into each Mainz Model double horn is equaled only by the professional sound and expression that they produce. The hand-hammered 11.9" rose brass bell offers superior projection and resonance. Tapered rotary valves provide the speed and precision professional players need. They also feature a rose brass mouthpipe, quick action Bb rotor mechanism, and nickel silver collars on the outer tuning slides.Hand Hammered Bell Each rose brass bell is hand-hammered by an experienced artisan to release the dark, full resonance and projection desired by professional level players.Custom Valves The tapered rotary valves on the 952RL offer the artist quick, smooth action and precise feel. The valve caps feature beautifully engraved accents that enhance the superior sound with superior visual presence.