The tecnifibre duramix hd 135 string will meet the needs of users who look for an outstanding performance comfort and durability the superior durability has been achieved with the use of poly filaments and the increased comfort is an effect of the multifilament construction to improve the product the string also features a new formula for the high density polyurethane that has replaced standard pu the string has a gauge of 135mm 15l and is supplied in a 200m 660ft reel