I bought these new for $124.95 each. Been very well looked after, absolutely like new. Unfortunately, my back is preventing me from playing anymore. Two racquets and a HEAD travel case (bought for $65) to hold both racquets and your gear.
Copied from the HEAD website:
The Head Intelligence i.S12 features one of the lightest swingweights and static weights available, which allows for great maneuverability and racquet head speed. Head heavy balance and wide open string pattern ensures that ample power and stability are readily available also.
Heads Intellifiber (integrated on both sides of the throat area) created from piezoelectric materials, has breakthrough new properties which make them extraordinarily unique and different from traditional materials
Energy Transformation: Using the mechanical energy of ball impact and converting - in less than a millisecond - into electrical energy.
Controllable Shape Change: An electrical impulse actively changes the shape of the Intellifibers for more stiffness.
The Power Benefit: In less than the first millisecond of ball impact, Head Intellifibers stiffen and reduce bending in the throat area for unmatched power in current racquet design. No matter how strong the material, a traditional racquet will still bend upon ball impact. This bending causes a loss of potential power.
POWER FRAME:
Feature: An innovative cross-section design featuring dual rounded bubbles in the throat and shaft area of the racquet, reducing weight by 6% and increasing torsional rigidity by 27%.
Benefit: Because of its light weight and stiffness, Head's PowerFrame increases torsional stability for less torque and twist providing optimum control and reduces weight maneuverability.