Barrel Side 2 (Standard): 1-7/8"w x 1/4"h, 4 color(s) max Barrel Side 3 (Standard): 1-7/8"w x 1/4"h, 1 color(s) max Clip (Standard): 1"w x 3/16"h, 1 color(s) max Barrel Side 1 (Standard):