Toysmith Window Writers Neon Window Dry Erase Markers Complete Set Bundle - 4 Pack Gift Set Bundle Includes 4 Neon Window Writers Window Markers: Blue, Green, Pink, and Orange Perfect for Any Occasion that Calls for Decorating And Writing On Windows and Other Non-Porous Surfaces Non-Toxic, Water Resistanct, Opaque, Dry Erasable, Water based Instructions On the Markers For ages 8 and up.