Features: 100% brand new and high quality Refills are transparent，the shell color random delivery. If you buy more than one, you may receive the same color or multiple colors. Fine point marker, is loaded with special ink that is only visible under UV light. It includes a mini LED UV black light with batteries, so you can view your messages. Lamp holder is a purple yanchao lights, write can't see A photo with purple lights will be displayed Students can use the pen mark important information in the text books, in order to more efficient to complete the review your lessons. Perfect for your Record the confidential information Specifications: Ink Color: Blue/Green/Pink/Yellow Style: Sent at random (if you buy more than one product,the color and style may be different or the same) Main Material: Plastic Structure: The shell ,Small batteries, The sponge. Style: Practical , Creative Stationery. Size :Length: 13.3cm（5.24in） Quantity:4pc Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package) 4Pc x Invisible Ink Pen