The Evans Magnetic Head Drum Key come equipped with an ergonomic design for comfort and ease of use. The knurled knob and magnetic head allows quick and easy application.The Magnetic Head of the Evans Drum Key prevents the key from slipping and ensures effectiveness in tightening the drum. The key grips to high tension ensuring that the drum won't buzz during play. The ergonomic design allows for more comfort and the knurled know allows for quick and easy spinning.Evans is a globally famous brand, pioneering the design of drum heads for over 40 years. Previous innovations include the EMAD, AC2S and the Hydraulic series. All Evans products are manufactured in the USA within the brands state of the art facility.