Evans Magnetic Head Drum Key is ergonomically designed for comfort and has a knurled knob for quick, easy spinning. It's magnetic head helps prevent slipping and stays in place for fast tightening and loosening. Rattle-free design: grips tight to a tension rod during play so it won't buzz. Evans drum keys are ergonomically designed to fit the needs of drummers in a wide variety of playing and tuning situations. With multiple available designs, Evans drum keys help drummers attain accurate tuning on-the-go, at a gig, or in the studio., Drop-forged magnetic head drum key, Magnetic head helps prevent slipping and stays in place for quick adjustments, Durable, ergonomic construction designed in conjunction with Ned Steinberger, Rattle-free design grips tight to a tension rod during play, All Evans accessories are designed, engineered and manufactured to the most stringent quality controls in the industry