Definitely not your grandmothers measuring cup set, Chef'n SleekStor measuring cups are sure to "pop up" every time you are baking! Simply expand for use and contract for storage. Space saving, innovative and fun, SleekStor Measuring Cups are a must have for every savvy baker. It's also very durable, since it's constructed from LMBG grade silicone. One of the highest rated on the market, and more durable and flexible than basic silicone.