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Head Sonic Pro is a comfortable and powerful polyester string. Players that love the control and spin that is expected of polyester strings, but don't want to sacrifice comfort and power, will love what Sonic Pro has to offer. Relative to other polyester strings, Sonic Pro is comfortable thanks to its soft. molecular construction that is made in Austria from uniquely refined co-polymer polyester. Overall, Head Sonic Pro provides players with very good comfort and power for a polyester string and above-average durability, letting you play with confidence.