Replace missing buttons, or add new accessories to an existing uniform! Band Shoppe's clear buttons are flat and ridge-free for a nearly invisible look. Plastic/acrylic 2-hole buttons measure 3/4" or 20 mm (size 30). Sold by the dozen. Sew-on only.Need some help before you order? Call our friendly Sales Representatives at 1.800.457.3501 with any questions and they will be happy to assist you.