Using the Wilson Pro Staff 6.0 85, these are @ 85 sq. inches. It's taken a while to collect these.
Clockwise from the top: Wilson Pro Staff 6.0 (T.W re-issue), Spalding Smasher, Wilson Pro Matrix, Spalding LeSport, Yonex RX330, Spalding Tour Pro, Le Coq Sportiff Concept 3- Roscoe Tanner...