Silicone stretch lids’ Features: Weight:250g Lids color:White Material:Food Grade Silicone Application:Sealing and Storage Package includes: 12 pack Silicone Lids Food Cover which size below: 20cm/7.8inch*2 16cm/6.3inch*2 13cm/5.3inch*2 11cm/4.4inch*2 9cm/3.5inch*2 6.5cm/2.5inch*2 How to use: 1.Place half of the food lids over one edge of the container.(Start on the side closet to your body). 2.Stretch the other half of the silicone food lids away from you,inching your way around the bowl. 3.Stretch,then press the top of the lids while pulling the tabs to create a vacuum seal. 4.Pull the sides to ensure a perfect fit. ·NOTE 1. Clean lids and keep them dry before the first use and after each use. 2. Lids can be used in the microwave or oven, but are not suitable for placing on the gas or electricity directly for heating. 3. 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.