Head graphenext speed s tennis racket the head graphenext speed s tennis racket provides easy playability and great manoeuvrability with thanks to a lightweight yet strong graphenext construction perfect for hard hitters tennis racket construction graphenext youtek technology weight 285g 101z head size 645cm sq 100sq in balance 330mm length 685mm 27 in string pattern 16 x 19 blackwhite l4