Herewith Kizuna Duratech D61 Top quality badminton stringing overview; Kizuna Duratech D61 quality badminton string by ERR badminton restring Singapore. Kizuna D61 is simply released in 2019. This Kizuna D61 badminton string as you could begin to see the gauge is slim only 0.61mm, but this string capable to provide “difficult” emotion.