prostaff st. vincent / early china / chicago. excellent on volleys. or maybe an early head; i.e, PC600 where you get that tin feel from the frame. The earlier Head Tour frames feel more like you're hitting with a tin/metal frame from the ball feel. Most of them feel more softer when you add a dampener. If you want to try full flex racquet try an early dunlop or the Prokennex Redondo. Any racquet greater ratio of graphite to other materials is going to be more flexible. 100% graphite racquets tend to hit excellent topspin, slice shots, but tend to lack the power of stiff racquets.