It's made of Silicone. Available in blue, green and orange Relieve stress, help restore the mood, home essentials, parent-child games, autism, games that the elderly, children, and adults can play. Just press the bubbles down and they make a slight popping sound; then flip it over and start again! Endlessly reusable and washable, too. layers take turns pressing down any number of pop pop Bubble they wish in a single row. The player who presses down the last pop pop Bubble loses. The latest decompression artifact, This pop fidget is a great sensory tool you fidget with again and again.