Private Reserve Spring Clamp Jars are clear glass jars with a rounded square design and silicone gaskets. All materials are safe for dry food and herb storage (but not long term home canning???please do not use these for canning). Ideal for display jars, cookie jars, or for items that will be accessed often such as coffee beans, dried herbs, and candies. The jars are equipped with clear gaskets, but also include colored spare gaskets (purple, orange, green, red, yellow, blue) for color-coding different contents. Also included are stick-on labels for identifying contents and storage date. Available in a range of sizes that include 18 oz, 27 oz, 34 oz, 49 oz, 70 oz, and 98 oz. This item, HPRJ18OZ6, is the 18 oz size (pack of 6).