They help in measuring the correct Stain / water ratio.

They a great size for mixing small batches of tinted shellac or lacquer for touchups, but I also drop a magnet in the bottom and stick them to the side of my vise to hold small screws or parts when working on guitars and amps.

They are not cheap, but if you clean them out they can be reused again and again.

Perfect size for guitar stuff. A little pricey, but they are hard plastic, and impervious to strong solvents. I just clean and reuse them.

Ok but hard to read the oz. or ml.

Didn't realize they were so tiny. They're shot class size. I was planning to use them to mix lacquer and reducer to paint my new guitar. They're way to small for that. The quality seems fine, just to small for my application.

Nothing special. They are mixing cups. They serve their purpose and they do it well. Graduations are nice and easy to read.

Two units of measure. Fairly cost effective

bought these with some dyes for sunburst finishes excellent little measurement mixing cups

Used with some grain filler. I pore filled koa, mahogany, and rosewood with it. While it's a very forgiving mixture ratio, these gave me an edge above 'eye-balling it' and didn't cost nearly as much as weighing it out. Perfect for me.

Handy for mixing dyes, stains or whatever...