This double ender marker with extra fine brush tip and it has acid free and non-toxic water based ink. This watercolor marker is the ideal pen for your art or rubberstamping needs. The fine brush tip is large enough for direct use on rubberstamps. Make multi-colored impressions by using two or more pens on the rubber before stamping. This conforms to ASTM D4236 standard and comes in carded packing. Available in black color. Measures 1/2-inch length by 2-1/2-inch width by 9-1/3-inch height.