Fulmoon 20 Pcs Party Favors Include 10 Light Ink Pen Invisible Ink Marker Disappearing Ink Secret Pen with 10 Mini UV LED Keychain Flashlight Marker Keychain for Secret Notes Identify Escape Room Game - Fulmoon-103

• Quantity and Color: the package comes with 10 pieces of invisible ink pens and 10 pieces of mini UV LED keychain lights (3 in yellow shell, 3 in red shell and 4 in blue shell), each invisible ink pen consists of 3 sections of pen shells in yellow, red and blue and 1 transparent cover, sufficient quantity and rich color will fully meet your use and share needs Size Information: invisible UV blacklight ink marker measures approximately 4.92"/ 12.5 cm long, 0.71"/ 1.8 cm wide and high. Mini UV LED keychain light is approximately 1.61"/ 4.1 cm long, 0.94"/ 2.4 cm wide, metal ring is approximately 1.26 inches/ 3.2 cm in diameter. Please double check to see if it is the size you need before ordering Reliable Materials: the glow in the dark marker pen is made of plastic pen shell and invisible ink, lightweight and odorless. The mini UV LED keychain light is made of plastic, metal ring and 2016 model button battery, safe and reliable for a long term use Purpose of Design: the glow in the dark pens are designed with invisible ink, so the content can not be seen under daily light, and the information will only react and appear under specific UV light, which can effectively protect your secret messages and security Usage Scenarios: children's invisible UV pens are suitable for use on a variety of surfaces including paper, skin, suitable for entertainment and safety purposes, our markers are often applied for blacklight events, glow parties, UV decor, birthdays, escape rooms, scavenger hunts, admissions, authentic return verifications, and so much more. If you need invisible marking that only glows in the dark with UV blacklight, this is the marker set for you