HEAD Sonic Pro Tennis String Reel, Black, 1.30mm by HEAD
Designed to improve elasticity, Head Sonic Pro 17 provides additional spin than its thicker 16 gauge version and offers up a unique combination of polymer additives to give a strong, yet flexible string. This combination of properties allows the string to remain durable, while providing additional power and depth in comparison to the typical polyester-based strings. Now available in a space saving reel, Sonic Pro provides excellent response without sacrificing a great deal of durability. Our testing staff was happy with the fairly comfortable response of the string bed and the added power was a nice bonus.