YM412X Magic， funny and challengeable. An amazing vanishing of your writings. Put the magi ink into the squirting pen and your writings will be invisible when you write by using this pen. Give a magical performance for fun. Let you feel magic charming. Easy to learn and easy to perform. Package Details Weight: 37.45 g Size: 16.5*7.8*1.7 cm Package Includes 1 × Squirting Pen 1 × Magic Ink 1 × Instruction