multifunction invisible ink pen funny marker magic uv light highlighter kids students gift novelty item school supply

product description invisible pen refers to the pen whose handwriting cannot be seen in normal light after writing, which can only be seen under the irradiation of ultraviolet lamp. it is usually used to mark objects or write statements that people do not want to see easily. features: 100% brand new and can write any of your secrets, will not be seen by anyone. you can mark your object, do not damage the appearance of the object, and can easily distinguish it from other similar