The Montana ACRYLIC EMPTY Marker is a premium quality refillable empty marker. This set contains all 5 markers in the series. Sizes include a Wide (50mm), Bold (30mm), Medium (15mm), Fine (2mm), and Extra Fine (0.7mm). This Montana ACRYLIC set saves money and give you a diverse selection of options for any style or project. The optimum flow control pump-valve system allows accurate handling and application. The transparent marker bodies allow for easy assessment of remaining marker content. Empty markers allow artists to customize their marker collection by filling the markers with the acid-free ink or paint of their choice, even mixing colors together to create custom and unique colors. Screw left to open! Designed for all surfaces and both indoor and outdoor use. Great for canvas work, handstyles, street art, or any other important art project.