The Wilson Steam 99s has a unique stringing pattern which gives this racquet the ability to put extra spin on the ball. Plus they are newly strung with Vokyl Cyclone 16 strings. This string is one of the best for creating spin. Together, the Steam 99s and Vokyl Cyclone create spin like no other racquet and string combination. The racquet is slightly head light, making it super quick at the net. Both racquets are 4 3/8. Both are in similar condition and were newly strung at the same time, just weeks ago. I am selling them together to save on shipping.