They are Computer modeled heads featuring the latest in face rebound technology. The faces are designed to spring back, as many popular heads are, BUT, these heads have the added benefit of being able to offer maximum spring effect for any swing speed. typically, maximum spring back only occurs on hard hits...leaving out the Senior and Lady Flex candidates.
This head maintains a high C.O.R. (coefficient of restitution) at any impact velocity. Hence the name - Tornado. The face is Micro Forged Stainless Steel with a special bracing structure behind the face. It is similar to the bracing in a ship's hull: small hyperbolic ribs that provide rigidity upon strong impact but allow medium and softer impacts to compress and expand. The result is distance, and plenty of it!