Features: Experience secure and fun invisible writing with our Invisible Inks Pen and LED Light Set, featuring 2 invisible marker pen and LED flashlight keychain for revealing secret messages instantly. Crafted from PP, this invisible marker set offer smooth writing and LED light for long time use. Suitable for children, adult, students, teacher, professional, and anyone who needing discreet document marking or creative art craft project requiring secret annotations. Widely used for kids birthday, party game, baby showers, school assignments, confidential file labeling, and interactive family activity using LED reactive secret messaging. Transform ordinary note into exciting discovery with this invisible marker that combines practical informations security with engaging LED revealing creativity. Specifications: Color: Black Component: PP Pen Size: Approx. 148mm/5.83in LED Keychain Size: Approx. 24.8x89.6mm/0.97x3.52in Weight: Approx. 30g Package Includes: 2Pieces Pen 1Piece LED Keychain note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color