Vibrant Craft Liquid Chalk Markers are a fun way to keep kids busy and happy. My kids love to draw and this is a mess-free way for them to have hours of fun. The set includes 8 colorful markers that are water-based and easy to erase. We simply wipe away using a damp cloth. They can draw on their whiteboard over and over without wasting paper. These markers can be used on any non-porous surfaces. They can be used on windows ( we like to show our team spirit during Bama football season and these are going to come in handy to write 'Roll Tide" on my truck's windows). You can use them on blackboards, chalkboards, whiteboards, glass, plastics and more. I like that these markers are non-toxic and odorless. These are a very nice marker set, great use for home or office. Also great for teachers. You can find out more about Vibrant Craft Liquid Chalk Markers @ http://www.amazon.com/dp/b00qpbvhaa I received these markers in return for my unbiased review.