The Deadly Rattler is a pearl version of the original Rattler but now features the new HK22 (Hyperkinetic 22). This cover is setting a new standard by which all coverstocks are being measured. With the addition of the HK22 cover, the Deadly Rattler offers a cleaner projection through the front part of the lane and a sharper continuous down-lane motion than the original Rattler. The Deadly Rattler uses the same core as the original Rattler with an RG of 2.480 and a differential of 0.035. Combining the Rattler and the Deadly Rattler, you get a venomous one-two punch.