The waterproof resonators on the pads, it leaves absolutely nothing to be desired. This series also has adjustable speed keys which considerably increase playing comfort. The beautiful engraving on the horn underlines the finesse of the instrument's construction. Key: Bb "Sona Pure" jar: Silver plated brass with protection ring and resonance plate Body: Silver plated brass Mechanical: Silver plated brass Treble F # clef Bass C # / Bb lever Adjustable metal thumb rest Blued steel springs Removable pavilion Adjustable left hand treble keys Octave Key Adjustment Screw PISONI buffers with metal resonators Right hand / left hand adjustment screw Flat phosphor-bronze springs Flag engraving Mouthpiece, ligature and cap Accessories Jupiter Light case