The Yonex ASTROX 77 is designed for players that want to overwhelm their opponents with speed and power. The medium flex shaft and head heavy balance help to deliver devastating power and sharp angled smashes. The ASTROX 77 Pro is the successor to the original ASTROX 77 with new materials such as FlexFuse located at the throat which helps with shock absorption and provides a softer feel. The elongated Namd shaft provides more flex to improve smashing performance.