If you use Tamiya paint, these are exactly the same bottles used by Tamiya and are a welcome addition when thinning these wonderful paints with IPA.

Relatively cheap, great to have some of these on hand. Hate to need them and not have them. Sometimes when airbrushing I'll mix a lot of paint upfront so I can come back and use it later either already thinned or if I'm missing colors.

It's just a empty bottle. However, I find I use it to clean brushes, store mixed paint, etc. I like that it matches the other Tamiya bottles which satisfies my OCD.