I bought these buttons new at The Button Shop in Malvern in 2012. They had a lovely selection and said they were mainly imported from Italy, Germany and Switzerland. They are of black plastic of some sort and have been etched into to make up the grey areas and then decorated with diamantes. The quality is very good. The left one is actually the biggest at a little under 4 cm and the other one is 3 cm. They have a self shank.