This is a set of two, already opened. I purchased them on Amazon. I used several from each, but I am selling them now that my orthodontic treatment is finished. Remaining amount (left in photo): 15 or more Remaining amount (right in photo): 30 or more I counted them through the bag, so there may be some error. Please check the photos. The outer boxes show signs of use. Also, please note that the outer boxes may be crushed during shipping.