Non Toxic Kid friendly Easy Clean Up 4 Pack of Markers available in 7 different color packs! (See photos for colors) Bright, colorful wet-erasable chalk markers! Tips are reversible to allow for either bullet point or chiseled tips! The Emmy & Mack packs are a thicker marker (6mm), while the others are slightly thinner (3mm). Perfect for use on all Non-porous surfaces such as glass, dry erase boards, mirrors, chalkboards(be sure yours is non porous) and more! We do always recommend supervision with children and suggest ages 3+. As with regular markers and paint, these can get messy, so play clothes or an apron would be ideal to protect clothing!