I am so glad that they have created a fantastic alternative to chalk. Chalk is dusty and messy, causing breathing problems in some susceptible people. CHALK TALK has come out with a set of colored markers to write on any non-porous material. I use it on the formica counter top, glass, mirrors, and chalkboards. We have white boards for teaching and these are so colorful. I like the florescent ones to grab the attention of the children. The tips of the markers push in to collect the chalk fluid and act like a felt tip marker so that the fluid flows easily. Remember to shake the marker so that you can hear the ball inside mixing the liquid.
I received this product at a discount in exchange for my honest and unbiased review.