The Prep Solutions MiracleWare by Progressive Microwave Perfect Pop! Popcorn Maker works with multiple sizes of your microwave safe bowls. The unique kernel measuring design in the center quickly measures and acts as a lid to contain popcorn as it pops. Just fill up the center cup, pinch and release kernels into the bowl. It measures 1/3 cup of kernels and pops 4-6 cups of popped corn. It is dishwasher safe and microwave safe.