These refillable empty markers feature a pump action valve which allows you to control the flow of the paint. Empty markers can be filled with your color choice of Angelus Acrylic Paint mixed with Angelus 2-Thin (1:1 ratio). Most colors will require adjusting with 2-Thin in order to flow right. One end features a chiseled tip, great for creating shapes and lines. The other end features a rounded tip, perfect for small details or line work.Details:12 sets3mm dual-sided marker tipsFeatures chiseled and rounded tipsSet Contents:2 Angelus 3mm empty paint markers10 dual-sided replacement tips2 eye droppersNote: Empty markers do not work with metallics or neons.