The Presto PowerCups Concentrators (Set of 8) makes is easy for you to prepare microwave popcorn. It is made from top-quality material, which makes it portable and lightweight. The microwave concentrators have an exquisite white color. It has a patented target design that concentrates microwaves to maximize the popping performance. This microwave concentrator is available in a set of 8. It reduces the cooking time for popcorn, preparing it in a matter of minutes. The Presto PowerCups Concentrators (Set of 8) from Presto is for making popcorn at home.