Option pads feature removable color pads within each pad for expanded versatility. Ideal for creating various color spectrum and direct-to-paper techniques. Also easy to clean and re-ink. Colorbox pigment pads are water based and formulated to stamp on absorbent papers. Slow drying inks are rich, thick, fade resistant, non-bleeding, acid free and archival. The ink surface is raised for optimum results on any size stamp. ASTM D4236 approved. Non-toxic. Includes 8 colors. Size of each color pad-approximately 2 by 1-1/2-inch. Overall measurements-4-5/8 by 1-5/8-inch. Made in usa.