Liquid Chalk Kids Chalk Markers. Reversible Tip. 10 Pack. 10 Colors. Smooth writing. Firm nib. Wipe clean. Consistent delivery. By Good Idea Hi-density liquid chalk markers for kids deliver STRONG SATURATION on whiteboard,glass board,blackboard, LED writing board,papers, andall non-porous surfaces. Can evendye hair! Japanese fiber nib wont go mushy or fray. SMOOTH WRITING. CONSISTENT CHALK DELIVERY from beginning to end. Works on almost any non-porous surface including: whiteboard, chalk board, windows, doors, and even your skin! Easy TO WIPE CLEAN. 100% water soluble. Let the artist in your child run free! REVERSIBLE nib lets you control the thickness of your line: Round tip or chisel tip.