With its unique multifilament construction with a blend of polyester and polyamide filaments Duramix HD offers performance like no other string. The poly filaments provide superior durability while the multifilament construction increases comfort over a monofilament polyester string. The feel from this string is crisp and precise. We could drop string tension low for added power without losing any control with this string. Spin potential is decent and somewhat between that of a monofilament poly and a multifilament synthetic. Duramix HD replaces Promix in the Tecnifibre string line up and offers a slightly stiffer feel compared to Promix. Gauge: 16 / 1.30mm Length: 40ft / 12.2m Construction: Multifilament Composition: 50% Polyester / 50% Polyamide with a 3SPL Silicium Pyrogene Lubritec anti-abrasion coating Color: Natural The Tecnifibre Duramix HD 16 Tennis String is now available online in India.