This multifilament polyamide has a gut-like feel with better durability and more comfort than a standard mono core polyamide. If you like synthetic gut, but are looking for something that lasts longer, this string is a good option for you. 1.25, 1.30, 1.35 and 1.40mm Colour.12m Packet, or 200m reels. The item "Babolat M7 Tennis String" is in sale since Friday, May 06, 2016. This item is in the category "Sporting Goods\Tennis\Strings". The seller is "stringersworld" and is located in Essex. This item can be shipped worldwide.