Uchida Bistro chalk markers are great to use on chalk board, dry erase Boards, light Boards, windows and windshields. The opaque, waterbased, pigmented formula is erasable with a damp cloth. You can make an eye catching display with these beautiful colors, or choose fluorescent colors and watch them glow under an ultra Violet light. Store in a horizontal position when not in use and make sure cap snaps on securely. Jumbo bulk fluorescent pink- 16mm tip.