Creative Mark Empty Aluminum Paint Tubes Make and Store Your Own Colors Easy To Open Screw On Caps Will Hold Anything From Watercolors To Acrylics - [Box of 24 | 60 ml Paint Tubes] Have you ever worked on a painting and wished you could preserve your mixed paint colors for the next time you sit down to work on it? We understand, because it has happened to us too! Creative Mark is known for providing tools to artists who enjoy creating and preserving colors and hues, for later use.Now they have created a line of the highest quality lined aluminum paint tubes with easy-to-open, screw-on caps. These tubes can easily be packed-up for plein air or used regularly in a studio. We have 4 sizes available and they will hold anything from watercolors to acrylics!Sold only in boxes. Diameter of nozzle opening: 9/32" or 7.14 mm Diameter of the bottom opening: 1-1/8" or 29.85 mm Perfect For: Artists wanting to preserve a custom color; Acrylics, Gouaches, Watercolors, Oils and any other paint medium!