Enjoy the fresh, healthy taste of stovetop popcorn with the convenience of the microwave. Made from temperature safe borosilicate glass, the main 3 Quart container can be filled with whole kernel corn and then microwaved without the use of oil. Like a little butter on your popcorn? The silicone lid doubles as a kernel measurer and butter melter--simply put a pat of butter on the lid while the popcorn is popping to enjoy a delicious snack.