This Square-Shape Educational Brain-training Toys is made of silicone. Great for children.Rules of the game: 1. Each person presses the raised mouse in turn, and the last person who presses the mouse loses. 2. Each person can press one mouse or multiple mice at a time, but they must be connected. 3. Each person can only press the mouse in one row at a time, not every other row. We offer customize your own design logo in the imprint area. Price includes a carabiner