Uchida's Fine Point Bistro Chalk Marker set is perfect for writing on any Chalk Board surfaces. They are erasable on whiteboards, light boards and other non porous surfaces. Chalk wipes of with a damp cloth. The Colors included are Fluorescent colors in: White, Orange, Red and Violet. Bulk Yellow- 6mm bullet tip. Uchida Bistro Chalk Markers are great to use on chalk board, dry erase boards, light boards, windows and windshields. The opaque, water based, pigmented formula is erasable with a damp cloth. Uchida's Bistro Chalk Markers write on chalkboards, light boards, windows and windshields. They are opaque, water based, pigmented and erasable when dry. This pen has a chisel tip.