- Diadem Impulse offers a perfect blend of comfort, touch, power, and feel. Players with slow to moderate swing speeds will benefit from the power of Impulse. Designed when an extra layer of polyamide coating to handle the sharp edges of Solstice for those players looking to hybrid. It’s also great for all types of players that love the classic gut-like feel of a multifilament. Tennis elbow sufferers looking for a softer, more comfortable string should also give Impulse a try.