STAEDTLER Double-Ended Calligraphy Pen Pack of 12 Assorted Colours, Model: 3005 TB12 ST Flip-top plastic bottles provide mess-free pouring and secure storage Original formula, back by popular demand, will surely be a favorite Non-toxic water-based pigmented ink produces bold, brilliant colors One pen with twice the pretty lettering power! This pack of 12 color-rich and double-sided calligraphy pens come with one narrow (2 millimeter) tip on one end and a broad (3-1/2 millimeter) tip on the opposite end, allowing a user to switch seamlessly between thick and thin strokes. These pens are great for any level of lettering or calligraphy artist, and can be used for expressive writing, coloring books, or making decorative designs. Transparent storage tray included.