It is a Portuguese company that produces them. ISI Soles developed the process and already sells ecological shoe soles made from recycled tennis balls. Experienced tennis players use 3 tennis balls per game or practice session. After this period, the balls reach the end of their life cycle. 300 million tennis balls are manufactured each […]
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source https://earthonsight.org/society/inspire/did-you-know-that-there-are-already-shoe-soles-made-from-worn-tennis-balls/
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