SO SIMPLE!-Insert paint pops in the pen, shake to mix colors, and start painting!The Shake & Paint Pop Pen Kit is a fun arts & crafts activity for kids!Paint pop balls can be stored if not used in resealable containers (included in set).Includes 1 Pop Pen Bottle, 1 Wide nozzle, 1 Brush Nozzle, 1 Paint Skin Blocker, 1 Finger Paint Stamper, 20 Paint Pops including: 5 Aqua, 5 Yellow, 5 Red, 5 Green, 4 replacement lids and instructions sheet.