Product size: 87mm Item Package Quantity:20 wide mouth silver aluminum rings for Mason, Ball, Canning Jars. Product Material:Rustproof silver aluminum rings,made by alumium, rustproof, durable, would never have rust problem as tinplate rings. Scope of Application:Widely used with regular mouth jars,Mason, Ball, Canning Jars, to make your jars into useful and interested parts at your home. Applicable Aspect?1.Protect food?Made by food grade aluminum, food safe and BPA free, and durable.Replace the existing ring made of non-rusted tinplate to increase the tightness and better protect food. 2.DIY Mason jar portable lamp?Creative Mason Jar Firefly lights Can Be Used Indoor or Outdoor for DIY Decor,Mason Jar Crafts,Very Popular Solar Lights for Any Occasion,Make Warm and Charming Atmosphere Mode for Your Patio,Lawn,Garden,Party,Wedding,Christmas,Perfect Home Decoration Lights.