Package content: a set comes with 30 pieces of mason canning jar replacement metal rings (without lids), adequate quantity for you to use, replace and sharing with your family or friends Material: the ring is made of iron, rust proof and durable, can be applied for many times; High and low temperature resistant, so it can be applied in refrigerators, dishwasher and microwave ovens Airtight sealing performance: our sealing rings can make many plastic or metal lids leak proof and air tight, each jar sealing ring features small grooves design for tight and secure fit, not easy to slip or move around, good to protect the food in your jars safe and fresh Widely applicable: these canning jar replacement rings are compatible with most mason canning jars, suitable for paired with most bottle, jar to store fruits, cookies, candies, salad, milk, smoothies, tea, coffee, screws or other small objects, come with good sealing, can rest assured to use colour: silver Material: iron size: 86mm Package Contents: 30 x Mason lid ring Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.