Silvertone pinbacks for your brooch creations. These are 1-inch size.
This listing is for five (5) pinbacks. Buy some beads because, on larger orders, you really save on the shipping! Last photo is an idea for usage--a beaded crocheted heart pin. Beads and beading wire available in other listings.
I'm not certain what they're made from. They're not precious metal or plated (which wouldn't last long), but I'm guessing steel. Like I said. Heavy duty!