DO NOT USE ON POUROUS SURFACES (this includes some chalk boards)n10 Liquid Chalk Markers set in beautiful vibrant neon colors - Including White, Red, Blue, Green, Purple, Orange, Pink, Yellow - make arts and crafts, sales board, art project, or design pop!nGreat for festive holidays and any other occasion - Decorate for Christmas, Thanksgiving, Easter, 4th of July, Birthday Parties, and Weddings!nMANUFACTURER MONEY BACK GUARANTEE - We strive to make the Best Products Possible. If youu0026#39;re unhappy with our product for any reason please contact the manufacturer and weu0026#39;d be more than happy to replace your unit or offer you a full refund!nWORKS ON ALMOST ALL NON-POUROUS SURFACES - Blackboards, Chalkboards, Restaurant Menu Boards, Glass, Windows, Whiteboards, Chalk Labels, Message Boards, Plastic, and Most Metal Surfaces.nNon Toxic liquid chalk markers pens with reversible tip that has a wide, thick and fine point chisel tip. Erasable, washable pens in bright classic colors.