Isometric head, Nano Technology and Nano Superlight Resin updates make these powerful and responsive frames even better. High Strength Head Loops also benefit from 'Muscle Tec' technology as they are more rigid due to the design of the Muscle section.M-TEC 80 Specification:80 Grams Frame Weight90% Nano Graphite - 10% Ti. Low Torque Frame. Muscle-Tec Wide Body Head. Head Loop takes up to 30LBS-13.6KGIsometric 'Flat Top' Head Shape. Nano Tec and Superlight Resin. Two Piece Construction