The Wilson Steam 105 S represents a giant leap forward in spin potential. This is because of the Spin Effect Technology, which uses a string pattern with less cross strings than main strings. The Spin Effect string pattern enables main strings to slide out of position further on a spin shot and then snap back into position providing added kick to spin shots as they leave the stringbed. The result, as confirmed by our playtesters, is massive spin. Also enhancing spin potential (and power!) is the extended 27.5 inch length. From the baseline our playtesters found a generous sweetspot with a stable and lively response. This is partly due to the Amplifeel 360 Technology, which reduces shock while increasing power. For our team the Steam 105 S proved to be the perfect weapon for hitting heavy shots with explosive bounce thanks to the huge spin potential. At net the 105 square inch head provides a luxurious hitting area, while the stability and power make it easy to stay aggressive on service returns. The added length is a genuine asset on serves where we discovered some serious pop and heavy action on slice and topspin serves. Best suited to 4.0+ players looking for easy power and more spin than you thought possible. Note: The open string pattern wears down string faster than usual. We recommend you use a polyester string with this racquet.