there are 3 different head sizes of rackets. here is an explanation of the different sizes from http://www.dummies.com/how-to/content/choosing-a-tennis-racquet.html
Over-sized: Beginners really like the over-sized and even jumbo frames, which offer between 100 and a whopping 140 square inches of strung surface. Such frames give you a larger sweet spot simply because the hitting surface is bigger, and they allow you to hit the ball farther from the heart of the sweet spot and still make a good shot.
Mid-sized: These racquet heads range from 85 to 100 square inches. Most pro players use frames on the low side of mid-sized - between 85 and 95 square inches. Most recreational players gravitate to the high side of mid-sized - between 95 and 100 square inches. Mid-size racquets offer a great compromise between a larger strung surface and sweet spot and a maneuverable frame that lets you generate good racquet speed when you swing.
Standard-sized heads: Ranging from 80 to 85 square inches, standard-size heads are now obsolete. They give you a smaller strung surface and sweet spot, making it more difficult to produce crisp, clean shots.
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