A variety of caps you can use with Mason jars and Classico pasta sauce jars to give them new functions. The pour cap lets to store liquids and dry ingredients to carry or pour whenever you want. Adapta Cap lets you turn a glass jar into a sprayer for cleaning products. Flip opens to a large diameter so you can open the top without unscrewing the iid and reach inside for contents contents (you can also purchase screens to turn it into a shaker. All caps come in assorted bright colors. Made in the USA from BPA-free food grade polypropylene.