Who doesn’t want to keep their goods fresh for a lot longer? Apart from having an incredibly airtight lid, the 500 ml Classic Screw Top Wide Mouth Jar comes with a patented ultraviolet glass. What makes this type of glass superior to all others is its light-filtering ability: it refracts damaging rays while letting in a beneficial light. In other words, it harnesses the power of the sun to enhance the quality of whatever you put inside it. Designed and tested in a lab, this jar has been proven to extend the shelf life of your grains, tea leaves, nuts, and all other kitchen and household essentials! • Airtight, smell-proof, & light-filtering: world's best ultraviolet glass jar with BPA-free plastic lid. • the perfect size and shape: a versatile container—great for herbs, spices, and cosmetics.