"WRITE YOUR SECRET MESSAGE Once your secret message is written with this invisible ink pen, you just need to wait for a few seconds and use the light on pen cap to make the words appear, so funny and amazingEXCITING SPY ACTIVITIES FOR PARTY You will love these spy pens; People love using this kind of pen to keep their secret and play detective spy games; Invisible pen brings you an amazing variety of fun activities. From Surprise birthday parties, to reviling a top secret message to their parents or grandparentsGREAT GIFT FOR FUN PARTY FAVORS This invisible Spy Pen comes in a pack of 8; Assorted colors to make the activity more exciting and fun; Parents could buy it for their loved ones party at home; Teachers can buy it for students for a school Activity. Add it for any surprise gift bag or as Stock StuffersPACKAGE INCLUDES4 reuseble invisible magic pens with built in lights. Batteries included and installed; Pens will come in a variety of colors (1 x Pink, 1 x Yellow, 1 x Green, 1 x Blue) to keep the activity excitingBUY WITH CONFIDENCE If for whatever reason you are not completely satisfied with our product, please contact us and our customer service team will get it resolved in 24 hrs/7 days" Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store