Size: 3 to 3 31mm 3 to 3 31mm 3 to 3 32mm 3 to3 33mm 3 to 3 34mm 3 to 3 36mm 3 to 3 38mm 3 to 3 40mm Heavy .032” diameter wire. Anatomical form and offset pads. Sandblasted mesh for increased retention. Size is measfrom in mm from the center of the canine to the contra-lateral one.