Hi! I just disassembled the button and re-used the sticker. The sticker that's holding the steel cap is part of the button assembly. I doubt You can buy it separately. Just try not to touch the glue on the sticker and pry it off with the cap, using something really thin, like exacto-knife or something similar. Also, when refitting, You have to be sure the sticker sits nicely in its respective cavity underneath the button. I have also cleaned Iphone 4s-s home button the same way