One dozen clasps, 4 different. The 3 foldover clasps are stamped "solid copper" on the backs and measure almost 1/2" long x 1/4" wide. The silver color clasps are 3/8" square and stamped on the back are the words: "Gold or rhodium electroplate clasp. Made in Japan". The round textured clasps are brass, measure 1/2" in diameter and have a patina from age. The floral clasps are 5/8" in diameter, appear to be brass but I'm not sure, and very shiny. This clasp is for a double strand necklace, and the square and textured round clasps are for a single strand.