1. Made of food-gade silicone, environmentally-friendly, non-toxic and safe. 2. It is stretchable to fit varieties of containers, such as round, elliptical, square, etc.. 3. Perfect for sealing food, washable and reusable. 4. Diameter: 6.5cm, 9.5cm, 11.5cm, 14.5cm, 16.5cm, 20.5cm
