Erasable Chalk Markers. These pigmented and water based chalk markers are a great alternative to traditional chalk. They are erasable with a damp cloth. Use on chalkboards, white boards, windows, windshields & craft projects. This package contains eight 51/4 inch long chalk markers in assorted colors. Conforms to ASTM D4236. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.