Specification: Name: Silicone Cover for Kitchen Food Material: Food Grade Silicone Type: Cookware Lid Advantage: Heat-Resistance Flexible Temperature: -40F to +450F (-40c to +230c) SAFE FOR OVEN OR FRIDGE Clean lids and keep them dry before the first use and after each use. Lids can be used in the microwave or oven, but are not suitable for placing on the gas or electricity directly for heating. You had better not completely seal container when you are using in Microwave or Oven, because the expanding heat and pressure from container, may result in damage or injury. HOW TO USE Place half of the lids over one edge of the container.Start on the side closet to your body. Stretch the other half of the lid away from you,inching your way around the bowl. Stretch,then press the top of the lid while pulling the tabs to create a vacuum seal. Pull the sides to ensure a perfect fit. Diameter: 2.6" (Will Stretch To 3.5"), 3.8" (Will Stretch To 5"), 4.5" (Will Stretch To 6"), 5.7"(Will Stretch To 8"), 6.5" (Will Stretch To 9"), 8.3" (Will Stretch To 10")