Isometric head, Nano Technology and Nano Superlight Resin updates make this powerful and responsive frame even better. High Strength Head Loops benefit from 'Muscle Tec' technology as they are more rigid due to the design of the Muscle section. One of our new models in the M-Tec series, it has the same frame weight as the market leading SL-70, marking the first time this weight has been achieved with an ISO head.