Kick and Tackle combo ring needs materials that don't exist in game

I combined my two rings to build the kick and tackle combo left ring. When I went to upgrade it, it requires pure protons. We currently don't have access to that so I burnt two rings on one I can not grind at this point.

@Roci187 Yes you can't currently get that material or Arena Booster items either. You can still level it up, just not upgrade it +20.