The tecnifibre duramix hd 130 tennis string has been developed to provide comfort and outstanding durability which is the effect of multifilament construction reinforced with polyester and manufactured with the use of a new formula for the high density polyurethane that replaces standard pu the users will definitely enjoy the feel from this string that is crisp and precise it has a gauge of 16l 130 mm and the length of the set is 122m 40ft