Fits regular mouth mason jars. Rust-proof and reusable mason jar screw bands! (Mason jar & disc not included) A screw band for everyday use. Mason jars are now used for so much more than canning, but the traditional tin screw band is not. Pron to rust and warping, tin screw bands have a limited lifespan and functionality. Enter tough bands. Store leftovers, dry food, household items. ferments, and so much more! Compatible Masontops products: Pickle pipes. chalk tops, coffee caps, sili seals, kombucha lid. Can be used whenever a screw band is needed. Not for heat processing or canning. Perfect for storing food, liquids and fermenting. Replaces rusty in screw bands. Easily twists on and off. Use with standards discs of any Mason jar brand. Fits any regular mouth mason jar. Dishwasher safe & BPA-free plastic. Tough band plastic screw bands for regular mouth mason jar. masontops.com. Connect with us masontops.com. (hashtag)masontops. Facebook. Instagram. Youtube. BPA-free plastic. Made in China.