Babolat Tonic + Longevity
Babolat Tonic+ Longevity is the same quality natural gut as Babolat VS, but without the same consistency in gauging (Longevity will be the thicker gauge of the two Tonic strings). Babolat’s exclusive Thermogut Technology Finishing increases durability by 25% and resistance to humidity by 60%. The new BT7 design reduces the number of filaments in the string from 15 to 7, but increases their size for added durability for the modern style of play.
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