Artisans Effect Liquid Chalk Radiant Premium Chalk Marker for Windows Chalkboards Whiteboard and Other Non Porous Surfaces with No-Odor Dry Erase with Reversible Tip For use on windows, whiteboards,chalkboard stickers, chalkboard contact paper, glass, tile, plastic Bright neon colors: yellow, green,red, blue, white, pink, orange and purple These markers come with a reversible tip by default they have a rounded tip but you can reverse them Non-Toxic -Our Liquid Chalk Window Marker Conforms to ASTM D4236 and EN-71 We also use a water base Artisans effect branded products comes with a 100% satisfaction gurantee