You probably won't make a mistake, but Crayola Project Erasable Poster Markers will erase it away if you do! These markers erase thoroughly from most poster board and heavy cardstock. Perfect for school projects, presentations and more! Mistakes can be neatly erased so you can create confidently and worry-free! Each marker has an ergonomic grip that is comfortable to hold. They are also fitted with chisel tip nibs which offer the ability to make thick or thin lines. Project Poster Markers for kids are essential for creating better school projects and posters at science fairs, art class, and beyond. This set includes colors: Red, Yellow, Green, Blue, Purple, and Black. Safe and nontoxic, the perfect art tool for kids ages 6 and up.