When I first looked at these I was suspicious as they were so hard the petals could not even be bent. Sterling is much softer and is easily bent if not over 13 gauge or so. I wanted to be sure before I complained so I bought a brand new bottle of testing acid (the one I had turned out to be too old to work) and checked these beadcaps. Sure enough, they are not only not sterling, they contain NO silver at all. They turned a bluish color which likely indicates the presence of Nickel. So disappointed in Art Beads and NUNN Designs. Both of the Nunn beadcaps lots were not sterling.
Delicate looking, but substantial bead caps are perfect for everyday works and as accents for those extra special pieces.
I used these with my "silver ear thread with cable chain" s (adding crystals) to make lovely, delicate earrings.