SM Royal Silicone Popcorn Maker This popcorn maker is Suitable for use in microwave ovens with an internal height greater than 6 Inches. Single portion popcorn makers. Each popcorn maker cooks about 1oz of uncooked kernels. Because space is so valuable, your popcorn popper collapses for easy and convenient storage. This makes this popcorn popper great for college dorm rooms and recreational vehicles and those who just enjoying a little more space in their kitchen.