Questions (5)  

Question: Do these coming with mixing balls? If not would you suggest adding a small ball bearing
ArtPrimo: No, they don't. Mixing balls are nearly always a good idea.

Question: will these warp from xylene based paint? if so, do you guys carry any fine metal tip markers that wont warp?
ArtPrimo: Xylene is a solvent that will most likely warp any non metal container. If you'd like to use a xylene-based paint, I'd suggest switching to a metal container.

Question: will xylene eat through these?
ArtPrimo: If you're worried about Xylene damaging marker bodies the only safeguard against this is to switch to a metal bodied marker.

Question: will this work with rusto paints
ArtPrimo: These will work well!

Question: Will smash ink work well on any of these or to drippy...
Scribe22: Ya you're good to use smash. Just make sure to actually use your makers once you fill them so they don't sit around with smash in em. The plastic is good quality so it won't eat through it or warp it too bad (in fact smash won't really do that in any mop, kids have irrational fears of smash being like acid) but you don't want your marker to get too tight and let the ink pigments separate.Ya you're good to use smash. Just make sure to actually use your makers once you fill them so they don't sit around with smash in em. The plastic is good quality so it won't eat through it or warp it too bad (in fact smash won't really do that in any mop, kids have irrational fears of smash being like acid) but you don't want your marker to get too tight and let the ink pigments separate.