Set of 10 tennis string rolls in various colors. - Materials: Nylon, polyester, etc. - Quantity: 10 rolls Thank you for viewing. These were bought in rolls about 5 years ago and cut into lengths of just over 12m. They have been stored in a dark place, but please be aware of the long-term storage before purchasing. I didn't feel any degradation when I used them. There are various manufacturers and materials, so please try them out. Tecnifibre XR3 1.25, Gosen Micro Super 1.25, Gosen Polylon Comfort 17, Gosen Polylon 17, Gamma Synthetic Gut 17, Winning Shot Ares 1.25, Babolat Revenge 1.25, Dunlop S-GUT 1.22, Head Master 1.28, Wilson Lightning XX 1.25