Children love blowing bubbles and it boosts eye-hand coordination, gross motor skills, as well as language development. MOTHER'S CORN Bubbles is a non-toxic, fun, smart and green way to play with bubbles. The set includes 200ml bubble liquid, bubble blowing tool & tray. The bubble liquid is made of natural cellulose extracted from trees, which is generally used for medical or food additives in ice cream or bread. Unique feature of this bubble liquid is you can blow STACKABLE, TOUCHABLE bubbles!