Chalk Markers by ZAM-Art

Here's what Amazon says about the product details:

• ZAM-Art® Liquid Chalk Markers are designed to be used on any NON-POROUS surfaces , feel free and enjoy using on Chalkboard Stickers, Chalkboard Contact Paper , Paper, Glass, Tile, Plastic, Metal, Whiteboard , Glossy Boards, LED Board , bistro boards, menu boards and any Non-Porous Surfaces .
• Cheerful colored liquid chalk marker pens with reversible 6 mm tip The Liquid chalk in ZAM-Art® Chalk Markers is completely Clean, Non-Toxic ,Dust free, easy to wipe with a damp cloth without any smudge associated with other chalks or markers. No dripping or ink runoff.
• ZAM-Art® Chalk Marker Pens is a unique children's Art Pens remarkable for its excellent value and creativity. Satisfaction Assured with our 90-day money back guarantee, backed up by Amazon's excellent customer service!
• Creativity has no limit with ZAM-Art® Markers, its Reversible tip (Bullet-Chisel) makes it fun to master both fine and bold works. Banners, Signs, Decorations for all occasions and parties will have a different face with ZAM-Art® Liquid Chalk Markers. It has been used on shop windows, Restaurant's and bar's menu boards, the limit is your imagination.
• The lively, striking designs of these Art Pena/ Markers are by itself is your reward; watch how kids enjoy it without the mess of the ordinary chalk or other markers. The drawings and banners will stay as long as you want it, and you can just wipe it out without any trace when you finish. Press Add to Cart now and have fun!

Here are my thoughts:

These are pretty sweet makers actually. We had a lot of fun creating fun art on our windows and mirrors. The colors are very vibrant and the chalk paint went on very smoothly. The instructions say to press in the tip for just 1 second to get the paint down, but it took more like 5-10 seconds. Also, you have to be careful not to shake it too much while holding it down or the paint will spill out. We had this happen with one of the markers and it caused the paint to run on the window a little bit.

Here's where you can find it:

Chalk Markers by ZAM-Art