High quality food grade silicone. Develop children's thinking ability, play the games according to the rules or your own rules to challenge yourself or quickly duel with opponents. Help restore the mood, relieve stress by yourself in life and job, also Interactive games that the elderly, children, and adults can play. Players take turns pressing down any number of mice they wish in a single row. The player who presses down the last mouse loses. It can be used as coaster. Diameter: 4 61/64.