These buttons are are 25mm long and between 18mm and 23mm wide. They're made of thin wood that's been printed on one side and then finished with a low gloss. The holes are 1mm wide.
These buttons can be used on items that are washed in a washing machine, but like all natural materials will keep its condition better if they are treated gently and hand washed.
Price is per button. There is slight variation in colour between buttons.