In sealed box. Listing is for 1 kit. Each kit contains 7 upper trays, 7 lower trays + whitening gel per tray. There are 4 kits available. $60 for all four of them. Purchased from a dentist office. Much stronger than the brands you can purchase in regular stores Each disposable tray is pre-filled with mint flavored whitening gel. Ultra thin tray material- designed to mold securely around each tooth for maximum comfort and uniform coverage. Upper & lower trays sized differently for best fit.