This group of 4 very shimmery and smooth brown buttons are slightly higher in the middle so that gives them the water look. They are made hard plastic and have shanks on the back. I am guessing these are out of the 70's or 80's sometime by the price and look of them. They are on their original cards and about 22mm wide or 7/8" and about 1/4" or 2mm thick. Please visit my Store for more new and used items to see. I will happily combine purchases paid together within a 7 day period. Thanks 5% GST Sales tax is required within Canada.