Small Earthing body band kits each come with one 8" elastic, adjustable band and Coil Cord plus one bonus 8" band and coil cord. You can use a band at night while sleeping or during the day while working or relaxing. You can use instead of, or in addition to, an Earthing sheet or mat. The accompanying Earthing coil cord permits some mobility, for instance, should you wish to be grounded while doing yoga.