MASON PRESERVING JARS: Our Mason Clamp glass jars have a specially designed clamp top lid with durable rubber gasket to ensure a leak proof and airtight seal. A HEALTHY LIFESTYLE. Glass is a healthier choice over plastic storage. Glass does not discolor, retain smells, or leach chemicals into food. These Mason Clamp jars are made from the highest quality of thick, durible, and BPA-free glass that is naturally chip resistant. MANY USES. No matter the task or where you choose to use it, these clamp jars can be used for almost anything such as (but not limited to); rice, sugar, spices, pasta, coffee, jams, butter, cheese, pickles, olives, or granola. In the bathroom or around the house holding; cotton balls, Q-tips, potpourri, flowers, craft beads/buttons, planting and succulents. . . the options are endless. WHATS IN THE BOX. This perfectly sized Mason Craft & More Pack of 4 Mini Sized Clamp Jar that holds 12 Ounces (0. 35 Liters). SURPRISE A LOVED ONE: Not only a perfect wedding present for a lucky couple, but perfect for an engagement party, a bridal shower and an anniversary, a house-warming, a birthday, Thanksgiving, or Christmas… or Just because (which is our favorite).