Wilson produced the throwback Staff 88 in 2008, a Pete Sampras signature model, produced for Sampras post-retirement and which he has used in the Senior Tour and other events since its introduction. This model retained the thin 17 mm beam throughout its length but has increased weight from 12.6 oz (357.20 g) to 12.8 oz (362.87 g) strung, is slightly less head-light (six points rather than eight), with an head size, up from 85 in the Pro Staff Original (the Pro Staff 6.0 was produced in a number of sizes) and with 19 rather than 18 crosses in the string pattern (retaining the 16 mains). The material composition utilized nanotechnology to bond new molecules that fill spaces between the racket's graphite fibers (branded [Karophite Black) to the graphite itself, rather than the unbonded fill used in Wilson's prior N-Code racket series. Most published reviews of this racket feel that the heavy weight and relatively small head size are ill-suited to modern stroke production techniques.