Ink Fun Color Stick Ink Colorless Words Hidden Words Graffiti Light Pen Features： 100% brand new and high quality. Quantity : 1PC 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 uvs 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 includes： 1 x Doodle light pen Product Name:Ink Fun Color Rod Ink Colorless Words Hidden Words Graffiti Light Pen Package Contents:1x Graffiti Light Pen Item color:Multi-color Material of the product:plastic Product Dimensions:One Size