TRANSFORM MASON JARS INTO LEAK-PROOF CONTAINERS: These durable lids have precision-engineered silicone gaskets ensuring a leak-proof & airtight seal. Great for storing liquid in glass jars without worries about spills or mess - in cars & baggage too! 100% FOOD SAFE PLASTIC: We've designed our Tough Tops using premium quality food-safe plastics. They're free of BPA plastic and contain no phthalates, so they won't leach toxic chemicals into your food & drink. Great for soup, yogurt & sports drinks. SUPER VERSATILE & MULTI-PURPOSE: You'll get endless ideas for your see-through jars both at home and in the office. The airtight seal makes them perfect for storing everything from first aid & beauty supplies, to craft items, hardware and much more! FACETED SIDES FOR EASY OPENING: Tough Tops provide a sure airtight seal, but that doesn't mean they're hard to open and close. The facected sides provide an easy grip. This also prevents the jar from rolling off the counter if it falls on its side. WILL NEVER RUST OR WARP: Tough Tops live up to their name. They're made of durable plastic to last for many years without rusting or warping like regular mason jar lid and band tops can. And they have no problem going into the dishwasher or freezer.