Content:16 pack with 8 big and 8 small.set of two. More choice, more usage  Color: red, pink,yellow, white,green, purple,blue,orange.  Usage:  -First, place marker tip vertically, and press tip slightly to release pressure. Second, Shake well.  -WITH cap on, and up-right. Remove cap.  -Third, press tip for a few seconds until tip fills up with ink.  -Note: You only need to do this for first time use. It took us about five minutes to do this to all of the markers.  Important Note:  -Use only on non-porous surface. Not suitable on most chalkboards, for if it's porous surface. Test on a small area first to see if it is easy to wipe off .  -Wash the tip thoroughly with water and dry it then use it like the first time if you feel the tip is not that smooth as always.  Features:  -Amazing versatility. Markers can be used on any non-porous surface and place like Menu Board, Window, glass, mirrors, plastic, metal, chalkboard stickers and so on.  -Wide range use situation, you can use them in your school, family, office, holiday decoration or working place.  -Not toxic and easy to wipe off.  -Artist or amateur, adult or kid, just let the bright color delight your life. Noticeable and eyecatching and impressive.  100% Risk-Free Guaranteed  Our seller warranty guarantees that your purchase is 100% risk-free. If for some reason your purchase doesn't work or you are satisfied with the products, We supply best service. We are committed to 100% satisfaction for our customers. If you have any problems, please feel free to email us. We will fulfill your request promptly, hassle-free.