specifications nanoray GlanZNR-GZ Infused with the new REXIL FIBER material and built based on the Torque Power Theory, the GlanZ sends the shuttlecock even further. Frame H.M. Graphite, REXIL FIBER, NANOMETRIC Shaft H.M. Graphite, NANOMETRIC, X-FULLERENE Weight Grip Size: 4U (Ave.83g) G4,5,6 Stringing Advice 4U 17-22 lbs Colour Brilliant Black