they will not rust. Durable for Use: Incredibly durable giving you that ability to keep reusing them without having to forgo any of the high quality. Perfect Color:they are perfect for that modern look that you want in your pantry. Tightly Sealed: These lids are the ultimate tight and fully protective covers. They come with silicon seal making sure your Jar is tightly sealed. Multi-purpose: Perfect for storing fruits, jams, cookies or colorful candies, storing soft drinks, tea or coffee, or storing nails, screws and other small objects. for standard wide mouth jars. The metal lids are more durable than plastic and do not stain. Ergonomic contours make the screw top lids easy to open and close. With silicone sealing gasket would seal the jar properly, no leakage problem. They are not for canning. These lids are for freezer, dry storage. colour:Silver Material:Stainless steel + silicone size:Diameter: 86mm Package Contents: 8x Jar Lids Only the above package content, other products are not included. Note: Light reflection 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.