Empty Aluminum Paint TubesMake And Store Your Own Paint Colors With Empty Aluminum Paint Tubes.With easy-to-open, large screw-on needle caps, these tubes can easily be packed-up for plein air or used regularly in a studio. They will hold any paint medium from watercolors, gouaches, acrylics, to oils! Key Features:Aluminum-lined empty paint tubes45mlComes with Easy-open capEasy to crimp endsAdhesive strip at end of tube for help seal prior to crimpingSealed nozzle (with needle cap)Perfect For:Artists wanting to preserve a custom colorMaking and storing your own paintWanting to replace your used tubesMixing your own colors and putting in a tube to labelAcrylics, Gouaches, Watercolors, Oils and any other paint medium45ml Empty Paint Tubes: Length with cap: 5-3/8″ or 136.52mm, Diameter of nozzle opening: 3/8″ or 9.52mm, Diameter of the bottom opening: 15/16″ or 23.81mm