These numbers are glued on the backs of queens. We use and like Tite-Bond II Wood Glue to attach these disks. A toothpick is used to apply a small amount of glue to the queen's thorax. The other end of the toothpick is then moistened and used to pick up the tag and touch it to the glue. Set includes numbers 1-99 in white, yellow red, green and blue. The color for 2016 is white.