YONEX ASTROX 100 ZZ Kurenai Special Edition Badminton Racket 4u5- Crimson Red. (unstrung). Yonex Astrox 100ZZ Kurenai badminton racket is a special limited edition colour: the weapon of choice for former World and European Singles Champion, Viktor Axelson. Featuring the SLIMMEST SHAFT EVER CREATED BY YONEX, the ZZ is able to slice through the air with reduced resistance. The ever popular ISOMETRIC frame has also been tweaked to create an EXPANDED SWEET SPOT – 2.9% larger than previous models. With attention paid to every detail, Yonex has even redsigned the cap at the top of the handle to reduce shaft twisting and increase flexibility.