Features: 1. Safe: using environmentally-friendly silicone material, environmental protection and no poison. 2. Excellent Air Permeability: the cover is soft and flexible and can stick and hold the border of the jar to provide good sealing. Keep food fresh and longer to avoid odor mixing. 3. Easy to Use: quite flexible and easy to pull, and they have concave and convex design of small handles which is easy to disassemble.