Those were current in 1986-1987, and were the more flexible version of the concurrent White Star Aero 20. The “20” referred to hitting area, % greater than standard size. The 20’s were approximately 82 square inches. Kneissl also made at the same time the Aero 30 and Aero 30 Club, with a +30% headsize (approx. 90 square inches). The Club models were a stylistic departure from the Kneissl norm of a white composite racquet (when most composite frames were black), in pastel shades, and featured a snap-in plastic strip to fill the string channel to make it even more aerodynamic.
Neat frames!
