Material:Silicone,It is non-toxic, tasteless.Very Good“POP” Sound | Circle Size: diameter :5 inch thickness:0.6 inch,Square Size: length of side:5 inch thickness:0.6 inch | How to play:Only press the round bubbles, they will make a slight popping sound, then flip them and start over! It is played in cyclicity,Useful for restoring the mood,Suitble for Adults And Children playing game. | Puzzle Game: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 exercises children's thinking ability, which is very interesting | 100% satisfaction guarantee, We Guarantee It is Very Good“POP” Sound,Contact us via Amazon message box and we will reply within 24 hours.