Pop, pop, pop.  This push poke pop bubble sensory fidget has a discrete pop sound.  It is not comparable to bubble wrap in sound but is just as fun to "pop."  Made of silicone.  

There are no loose or noise-making pieces, making it great for playing in a car, bus, or plane, in a restaurant or at school.   You will receive a square one

Not intended for use by aggressive users ... not recommended for children under 5.