The product is a vintage Wilson Speed Flex tennis racket signed by Jack Kramer. This rare and collectible signed item features a 4 5/8" grip size . The combination of the well-known Wilson brand, Strata-Bow vintage design, and the signature of Jack Kramer add to the charm and value of this unique tennis racket. This Wilson speed flex fibre face racket was designed and made in Belgium. A beautifully handcrafted peace desired by many collectors.