The Yonex Astrox 100 ZZ uses revolutionary new technologies to increase racket performance. The 100 ZZ has a Hyper slim, solid shaft to improve resilience and increase the snapback performance. The shaft design reduces air resistance by 11.8% resulting in a faster swing. The evolved Isometric headshape makes the frame top and side flatter to increase the sweet spot by 2.9%. Heavier weight for greater power.