The Securit Liquid Chalk Marker is s non-toxic, highly opaque liquid chalk marker with a fine round 1-2 mm nib. Non-smudging (when dry) and resistant to fading and staining. The maker is suitable for all non-porous surfaces. Easy to use, simply shake, push the nib down, write or draw, and allow the writing to dry for a couple of minutes. There are 7 assorted chalk markers in a blister pack.