Second Throw Tennis Balls are used tennis balls for use as dog toys, still in great condition and with good bounce left. These balls are from tennis facilities nationwide, so there will be a mix of different brands and each one will be a smell adventure! Upcycled tennis balls are sourced directly from tennis matches and courts (not from other dog owners) and sorted without any washing or bleaching. These balls are not designed as chew toys or for digestion, so always monitor your dog during playtime to ensure their safety.