Multifunction Luminous Light Invisible Ink Pen UV Money Checker Kid Drawing Learning Pen 20ml Feature: Quantity: 1PCS Boys Girls Great Party bag fillers toys for kids. Writes on most surfaces. With built in Ultra Violet Light, Kids will write plenty of secret messages to each other and its not visible to the naked eye turn the UV light on the writing appears Note: You can write on most surfaces, but whether it can stay on the surfaces It depends on what kind of the material you write on. If you write on the papers, it can stay on permanent; if you write on the metal or plastics It may couldn't last long, because it will be erased easily due to the characteristic of the metal and plastics. Size:about 13CM Material:Plastic Package Content: 1X Secret Message Pen Highlighter Pen pencil sharpener,pencil sharpener for kids,pencil sharpener with cover,pencil sharpener manual,pencil sharpeners for school,pencil sharpener electric,pencil sharpener with receptacle,pencil sharpener handheld,pencil sharpener battery,pencil sharpener with lid,pencil sharpener electric plug in,pencil sharpener battery powered,pencil sharpener small,electric pencil sharpener,pencil sharpener heavy duty,pencil sharpener for classroom,gel pens,writing pens,pen,pens,color pens,teacher pens,le pen,gel pens colored,teacher must haves,gel pen,erasable gel pens,fun pens,teacher supplies,colored pens,journaling pens,gel pens for coloring,pens fine point smooth writing pens,nursing school Essentials,cool pens,pens bulk,colorful pens Invisible Ink Highlighter Red Committed to creating a comfortable and warm home environment for families so that every family member feels happy and satisfied.