Babolat Spiraltek REEL Tennis String (Black, 17G) For players who prefer synthetics and want a versatile all-court string, the answer is the new Babolat SG Spiraltek. Size - (17G) Color - (105 Black) Power Authorized Babolat Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.