Herewith Kizuna Duratech D61 Top quality badminton stringing evaluate; Kizuna Duratech D61 high quality badminton string by ERR badminton restring Singapore. Kizuna D61 is just launched in 2019. This Kizuna D61 badminton string as you could see the gauge is slim only 0.61mm, but this string equipped to provide “really hard” sensation. D