Confidential, a shaped co-polyester string from Solinco, has lived in the shadows for a few years. The control comes from a familiar Solinco formula consisting of a stiff monofilament construction punctuated by four grippy edges (think Hyper-G and Tour Bite). The result is the kind of spin-friendly precision that brings the ball down on a dime. Confidential is likely too underpowered for beginners, and it may not win over players who require the plush feel of a natural gut or multifilament nylon. However, for the experienced ball striker who wants a durable co-poly that rewards full swings with pinpoint accuracy, Confidential is hard to resist.