Head Graphene XT Speed MP A Tennis Racquet - Unstrung The XT Speed MPA has Head's interchangeable grommet system that can switch the string pattern from 16x19 to 16x16 for added power and spin. The 16x16 string pattern really puts extra depth on the ball and bites into it for added rotations. Head Size: 100 sq. inches / 645 sq. cm Length: 27 inches Strung Weight: 11.1 oz. / 315 grams String Pattern: 16 Mains x 16 Crosses (can be changed to 16 Mains x 19 Crosses). Racquet is strung in the 16x16 pattern and ready to use.