Code drum heads are purpose-built, designed by drummers for drummers. They have matched time honoured and trusted manufacturing techniques with up to date cutting edge technology to produce a new premium range of drum heads. All their heads use the highest quality PET polyester film, kept securely in place by Code's revolutionary Grip-Tight™ rim technology. This unique innovation features a deep, double-knurled solid steel core securely crimped by a high-quality aluminium rim, to ensure the head stays put while you play. It also allows the head to resonate freely, tune easily and super quick, and hold its tuning longer. Plus, all materials used to manufacture Code products are 100% recyclable. Code Signal series heads have a thicker single ply of 14 mil PET film to give a powerful deep tone with plenty of attack. The Signal kick drum heads feature an internal deadening ring to assist with overtone control and focused punch. Available in sizes 16-24", in Smooth or Coated finish.