This ready-to-use application tool allows for fast & precise application - where you want it, when you want it! The pump marker contains coloured masking liquid so you can see where it's been laid down. The easy to peel off, water-based formula is removeable without residue on multiple surfaces & creative media. Simply apply the masking liquid on the surface NOT to be coloured and allow to dry. Next apply your coloured layer. Let dry briefly & rub off with your finger or an eraser. Note: for best results masking fluid should be removed within 2 days. With its patented & refillable marker technology, these marker pens are unique for all applications. They're compatible with paint, markers & ink etc. Pens have a patented Capillary System and contain FLOWMASTER pump valve/mixing balls and are refillable and their nibs are exchangeable. Available as a 2mm and 4mm marker application tool. Made in Germany.