The Molotow Aqua Ink Empty Squeeze Pen 3-Pen Set - 1mm, 3mm, 4mm Tips is the perfect application tool for fluid alcohol-based inks and water. Each pen holds 20ml of fluid ink or water (Ink sold separately). Simply squeeze the body of the pen to easily regulate the amount of liquid you are applying to your surface. Pen tips measure 1mm, 3mm and 4mm, and pens are available in six different tips, similar to that of an actual paint brush. Refillable pen is an economical and sustainable solution for any artist. Made in Germany.