These silicone sealing rings make many Mason Jar lids leak proof and air tight! Theya re designed for white plastic Ball storage caps, Mason Jar Lifestyle plastic storage lids, and MJL stainless steel lids.

If your silicone seal is loose, stretch it slight like a rubber band and it will stick into the lid better.
Made of platinum cured LFGB European grade silicone rubber, these seals are dishwasher, freezer, and microwave safe! They’re easy to remove and clean. Silicone is a non-plastic, BPA-Free material for food that does not leach any chemicals.
 
There is nothing worse than capping your Mason jar with your leftovers with a regular lid, tossing it into your lunch bag, having it tip over, and leak over all everything! Well lunch time disasters are a thing of the past with our leak proof silicone sealing rings.
 
Leak Proof
LFGB European Grade Silicone
Dishwasher Safe
Freezer Safe