COMPATIBLE with TECRE, NEIL, American Buttons and most made-In-America machines NOT COMPATIBLE WITH Badge a Minit, Daweii, Mophorn, Yescom, Amazon Red Machine or other Chinese made machines. Box of 100 Pin Sets to make 3 Inch Buttons with compatible Button Machine Makers. Most American machines use this sizes of pins. Parts are lightly smaller so when assembled the button measures 3 Inch diameter. Includes 100 metal Shells, 100 Metal Backs with inserted Pins and 100 plastic circles to cover the custom design for your badges.