Safe for Food: These shower s are made of PE plastic; microwave safe; the reble bowl covers make cleaning up after cooking or dinner leftover stora so much easier Sourdough Bread: These shower s are helpful for keeping the moisture of the dough in the bowl,preventing it from drying out during the proofing,and creating the ideal environment for dough fermentat Easy to Use: The plastic bowl covers fit over a majority of bowl and plate sizes; easy to remove and reseal repeatedly; using food covers is a great idea for qui use and a great alternative to tinfoil and clingfilm Good Elasticity: The reble shower s can be stretched,covering plates and bowls of various shapes; the elastic band tightly adheres fresh keeping bags to the bowl,preventing dust from entering and keeping food fresh Sturdy and Reble: These bowl covers are sturdy and anti-puncture,and not easy to rip; plastic bowl covers can be repeatedly cleaned and you can reuse many times; handy for bread proofing and storing leftovers,a must-have kitchen gadt.