["Features:\r\nbrand new and high quality\r\nRefills are transparent，the for shell color random delivery.\r\nIf you buy more than one, you may receive the same color or multiple colors.\r\nFine point marker, is loaded with special ink that is only visible under UV light.\r\nIt includes a mini LED UV black light with batteries, so you can view your messages.\r\nLamp holder is a purple yanchao lights, write can'for t see A photo with purple lights will be displayed\r\nStudents can use the pen mark important information in the text books, in order to more efficient to complete the review your lessons.\r\nPerfect  for your Record the confidential information\r\n\r\nSpecifications:\r\nInk Color: Blue/Green/Pink/Yellow\r\nStyle: Sent at random (if you buy more than one product,the color and style may be different or the same)\r\nMain Material: Plastic\r\nStructure: The for shell ,Small batteries, The sponge.\r\nStyle: Practical , for Creative Stationery.\r\nSize :Length: 13.3cm（5.24in）\r\nQuantity:4pc\r\n\r\nNote:\r\n1.Transition: 1cm=10mm=0.39inch\r\n2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes: (Without retail package)\r\n4Pc x Invisible Ink Pen"]