In the 1990s, Wilson produced a range of lighter Pro Staff models called "Pro Staff Classic Lite." They featured larger head sizes (95 and 110 sq in) and a more flexible frame than either the 6.0 or the 6.1. The series produced Steffi Graf's racquets of choice in the 1990s as she signed an endorsement deal with Wilson in 1994 after having played with Dunlop since the beginning of her career. Graf first played with the 7.0 model, then switched to the 7.5 model in 1996 and finally to the 7.1 model in 1998, which she played until her retirement the following year.