Originally recognized as the "Jimmie Pratt" Bass Drum Muffler, this muffler system was designed in collaboration with Gretsch artist Jimmie Pratt in 1950. Depending on the level of engagement, the BD Tone Control allows a variety of muffling by simply turning the external knurled knob. This brilliant design takes away need to stuff your bass drum with any pillow or towel. Gretsch Bass Drum Tone Controls are offered as an aftermarket accessory or custom build option for your USA Custom or Broadkaster drum kit.