NANOSCIENCE technology - With streamlined aerodynamic NANOSCIENCE technology built into the shaft for a stiff flex and unparalleled repulsion power, the NANORAY 68 Light is engineered for lightning-fast shots\nUltra-light (77 grams) - Speedy shots & great maneuverability without sacrificing on power | High tension support (30 lbs string tension) - more power and better control. Head Size: 6.5 sq. in.\nIsometric head - Bigger sweet spot | Built-in T-Joint | Carbon Graphite shaft - strong construction and light weight\nSpecifications : Frame Material - Carbon Graphite | Shaft Material - Carbon Graphite | String Tension - 30 lbs | Weight - 5U (75-79.9 grams) | Grip Size - G4 (3.5 inches) | Balance Type - Head Light | Head Shape - Isometric Head Shape | Pre-Strung - Strung | Age - Adult