Pentel Wet Erase Jumbo Chalk Markers Ideal for use on all blackboards, whiteboards, glass, ceramic, metal and non-porous surfaces Imitates real chalk Fade-resistant Wetwipe formula means ink will not erase accidentally Waterproof after drying, so it can be used inside or outside Extra tough chisel style valve tip means crisp clean edges to lettering with a variety of looks, regulated ink flow to eliminate blobbing and leaking, and will retain its shape without fraying even when used on uneven surfaces Wallet of 7 contains blue, red, green, yellow, orange, violet and white