Head Graphene XT Speed MP Tennis Racket Featuring Head's exclusive Graphene XT Technology and used by ATP star Alexander Zverev Headsize 100 square inches / 645 cm2 Weight 11.1 ounces / 318 grams (strung), 10.6 ounces / 300 grams (unstrung) Balance 8 points head light / 320 mm (strung) String Pattern 16 Mains x 19 Crosses - Racquet is professionally strung with HEAD strings