Paint Marker – Uniball – PX-20 – Medium 2.2mm Bullet Point – Assorted The uni-ball paint marker from uni-ball is an incredibly versatile oil based permanent marker that writes on almost all surfaces including metal, wood, glass, plastic, fabric and stone surfaces. The Super Ink it uses is waterproof, fade resistant and heat proof, it produces a glossy finish that makes the marker suitable for students, artists and tradesmen alike. 1.8 – 2.2mm acrylic bullet nib.