Flex: Stiff Head: Square/Isometric Weight: 82-86 grams (4U-) Grip: G5 Balance: Even Balance Head: High Resilient Modulus Graphite + PYROFIL + Hard Cored Technology Shaft: High Resilient Modulus Graphite + PYROFIL + 6.5 SHAFT SEVEN SIX - The single-pass grommet hole construction creates less friction between strings, this effectively reduces tension loss, while extending string life PYROFIL - PYROFIL carbon fiber and its composites, are advanced high performance materials from Japan. The characteristic of high intensity bonds ultra-light offers racket excellent shock-absorption and enhances control Hard Cored Technology - Inspired by military helicopter, multi-layered structure made by carbon fiber and composites, minimize material size, reinforce handling feel and performance at a critical standard Anti-Torsion System - The shaft is key to power transmission, and that's why VICTOR has been committed to developing better shafts. Through the combination of highly resilient materials and innovative design, VICTOR has created the best shaft ever with incredible anti-torision performance and resilience.