Welcome to our store! Invisible writing: send an invisible message, then use ultraviolet light to make it visible. This makes it possible to send a hidden message without being detected. Ideal as a party favor: children love to play detective and spy games with these invisible ink pens. The invisible ink pen offers you a variety of fun activities such as treasure hunting. Safe and odorless ink for healthy toys for your children. You can write anywhere: t - shirt, paper, skin. Permanent but washable (do not use on special surfaces like glass or smooth plastic films). 14 pencils in 7 different colours: batteries included and mounted. The different colors make the event more exciting and fun. The ink inside the pen is the same color. Parents can buy it at home for their children's birthday party. In schools, teachers can buy for school activities. It can also be used to decorate surprise bags or Christmas stockings. There may be some size errors in the product you receive due to hand measurement < p>The product you receive may be slightly different from the picture due to different monitors Thank you for meeting me, hope I can help you. Good life Actual quantity shipped: 14 piece(s) 100% satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service