Review on Colorful Precision: ZEYAR Twin Tip Permanent Markers Set With Ultra Fine And Fine Point For CD/DVD Marking And More, 12 Colors by Cassie Moore

These work BETTER, WAY BETTER than sharpies professional permanent markers. They have an industrial one, or something like that . it's meant to not wipe off, and be more permanent than any of the others in their brand. That sheet smudged off the plastic. Granted.stayed a minute longer than the normal ones.but by no means "permanent". These markers.holy crap. Hallelujah. They don't smudge or wipe off plastic unless you try to rub it off, and if you do that, you really really need to work at it. This is the best one I've found and I just ordered 3 more packs. I'm using them to label eppendorf vials, which are plastic and require handling to open and close, causing the usual sharpies to last 2 seconds. These.primo.