Do you use stencil ink or marker pen and paint the brand of your racket (eg yy) on your strings? I tried it before on my Proace and Yonex rackets. But after a while, I decided that since Yonex and Proace did not pay me to use their rackets, why should I advertise for them for free! : ) I actually printed out the logos from Yonex and Proace websites (after resizing them) and make stencils using cardboard. It was great fun anyway.