The microwave lid is made of microwave safe heat-resistant glass, silicone and ceramic, and does not contain metal or plastic. It is very effective in preventing messy spills and splashes in the microwave, so you don't have to clean the microwave frequently anymore. There are two ventilation holes at the top of the lid that allow steam to escape while keeping the food moist and restoring its original taste. This transparent glass microwave cover for food stands 3.9 in. tall and is suitable for a variety of bowls, plates, and containers ranging from 6 to 12 in. The microwave splatter cover is made of durable thick glass that can withstand high temperatures. The transparent glass material allows for easy monitoring of the heating process, making it convenient for daily use. This microwave splatter cover is composed of glass, silicone knob and ceramic screws,and does not contain any chemicals such as plastics. It is BPA-free and ensures food safety during microwave heating. This microwave glass cover is very easy to clean and usually only requires wiping. It is also dishwasher safe, ensuring it looks brand new regardless of the cleaning method you choose, saving you time and effort. Glass is fragile materials, so please avoid impacts and drops during use.