Super like head heavy ? Wondering can Kason C7 Arcustec grommet fit to others racket ? Yes. I just tried to fit in my N90. Wondering how that beast head heavy racket's smash could be... My experience to share. It can b fit to 72 grommet holes rackets. RSL, Kason & li ning. But not all. But definitely not compatible for Yonex. Here is my racket. Will strung up to 28lbs and feedback to u guys again of my reviews.