This size #30 button shell has a diameter of 3/4" before covering and is boxed with 144 shells and 144 style 44 wire eye backs. This has a "U"shape smaller loop specially designed to prevent fabric damage and pull through in delicate material. You need steel button cutter,covering die (Item #BMPD30), and button covering machine (Item#BMPM) to assemble this button for a professional look. This item is sold in a 1 gross box (144 pcs. of each item).