Add a magical glow to t-shirts, tote bags, baseball caps and much, much more with these glow-in-the-dark fabric paint pens! These fabric paints come in a rainbow of fun colors that kids love! Assorted colors. Each 4 1/2" plastic tube contains .36-oz. of non-toxic and machine washable paint. Remove the plug in the tip before use. Conforms to ASTM D-4236. Expose items to daylight to activate glow.