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, Dunlop McEnroe Boron, Dunlop XLT Comp, Slazenger PhantomComp, Wilson Aggressor (x 2), Wilson graphite Force, Wilson Jack Kramer Staff, Wilson SC Sting, side-Black Knight Boron Graphite, Spalding Power Tech 100 (excluding the upper & lower ovals) Wilson Sting & Slazenger Phantom Silver Wilson Pro Staff 6.0, Slazenger Phantom Comp & Spalding Smasher. (Aside from other Wilson's) to me these 3 feel close to the same- hitting, weight, etc.