This size #30 button shell has a diameter of 3/4" before covering and is boxed with 720 shells and 720 style 44 wire eye backs. This has a "U" shape smaller loop that is 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 5 gross box (also available in 1 gross box).