Washable pen/water color pens: It's a little different from normal water color pen. Here washable pen is a kind of fabric marker, which is mostly used to mark on fabric cloth and other industrial material instead of use in school and home. Sure, it certainly can be used as normal water color pen in school and home by kids. 1.The marking can keep for a long time and easily removed/washed off under normal laundry. 2.Mainly used for temporary drawings, and easily write on fabric&textile, cloth and skin, leather and plastic, glass and ceramic, garment and wood etc. 3.We can provide a variety of tubes/barrels, nib sizes and packing according to your specific requirements. And usually 12 common colors available. Other colors can be offered under order production. 4. Non toxic ink, and conforms to ASTMF963 and EN71PART3.