This dripstick has a rear tank cap that makes refilling easy and clean without getting your hands dirty! With a gentle squeeze of the bottle body and a special spring, you can effectively control the ink-flow for a smooth application. Its special feature is the Rollerball applicator, perfect for painting on rough surfaces like stone and concrete. Plus, it's compatible with nearly all paints and inks (fluid and viscous) for drip effects and large-scale applications. Made in Germany with a filling quantity of 30 ml, it also comes with an exchangeable 3mm Rollerball applicator suitable for rough surfaces. Keep your artistic journey hassle-free with Dripstick™ Rollerball.