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Mouth Strength Trainer, Posture Correction Brass Material Coating Finish Trombone Pressure Reducing Valve Ergonomic Design for Wind Instrument (Gold) : Musical Instruments
Mouthpiece Strength Trainer, Ergonomic Design Posture Correction Trombone Pressure Relief Valve Easy Installation Good Comfort for Wind Instrument (Gold) : : Musical Instruments, Stage & Studio
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Trombone Pressure Relief Valve Brass Mouth Strength Trainer Wind Instrument Mouthpiece Accessory
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Acute effects of jaw clenching while wearing a customized bite-aligning mouthguard on muscle activity and force production during maximal upper body isometric strength - ScienceDirect