If your props are white you can use a red sharpie, covers well and doesn’t effect its weight. I’ve been unable to find a white sharpie for my black props tho...
I’ve had two kai deng 70s and both were junk, it was like they had minds of there own, did not fly well at all. The reason I got them was because the YouTube videos rated them so highly, they called them x8 killers? I don’t think so. Come to Little Rock and you can have em for parts....free