All buttons (exept pearl and the boxes with 8mm buttons) are 10mm and can be used with the tools from Prym (sold on this site too). The pearl buttons are 12mm and they fit in the tools from Prym too. All four parts are included each package include 10 or 50 buttons (only some can be ordered with 50 buttons). All buttons are nickel free.
Wash the clothes with buttons inside out in maximum 40 degrees. Do not tumble dry.