Cheyenne Hawk D-Grip (Ergo Round) Cheyenne Hawk D-Grips are the first internally threaded disposable grip designed for use specifically with the Cheyenne Hawk Pen Machines. Hawk D-grips are available in three sizes so that you can choose the perfect grip size and comfort level: One Inch (smallest), Round (middle-sized), and Long (largest). These Cheyenne Each plastic disposable grip sits on the end of the pen and doesn't slide along the tube, so you can perform at your best with precision and accuracy.