Review on Invisible Disappearing Activity Stuffers SyPen by Pius Aponte

We bought three of these packs for mixed grade 1-3 science and arts classes. They were inexpensive enough to buy one for each student and were a huge hit. One pack had two pens with completely dead batteries and the other pack had one pen uncapped and completely dry so you can give yourself some wiggle room and order more if you need a certain minimum quantity (the failure rate on our order was 3 /36). Also, if it doesn't ignite right out of the box, try twisting the end of the cap a little; For some of us, the button on the lid was not properly aligned with the switch. Button batteries can be replaced by removing the end of the cover. These UV LEDs are bright enough to make neon paints/plastics/markers glow brightly and charge glow-in-the-dark items. Consider using neon crayons, pencils, or gel pens. We've had good results drawing on black paper with neon crayons or pencils, and on white paper with invisible/UV ink, markers, neon highlighters, and neon gel pens.