Collapsible Design: Adopt separation cover, can change part of cap at any time to reduce waste. The sealing ring not rub with the jar mouth, not easy to be damaged. Meanwhile, the glass jar is clear and has high visibility, allows you to distinguish the storage contents inside quickly. Airtight & Freshness: Each canning jar has a solid metal screw sealing lid and rubber lining which plays a leak resistant role-keeps food fresh and extends its usage life. Food grade jar, it is ideal for fermentation, pickling and canning. Quality Material: This 24 ounces glass mason jar is made of durable thick glass, sturdy and refillable.