Herewith Kizuna Duratech D61 Top quality badminton stringing evaluate; Kizuna Duratech D61 quality badminton string by ERR badminton restring Singapore. Kizuna D61 is simply introduced in 2019. This Kizuna D61 badminton string as you may begin to see the gauge is slim only 0.61mm, but this string ready to offer “really hard” experience.