Fold-over/clamshell sterling silver bead tips. Approximately 3mm cup. Designed to completely hide your knot. Once you fold and press the halves together, it looks like a round bead! For finishing the ends of bead cord. These work well with size 4 and smaller cord. Flexible needles go through the hole easily but most other needles won't. Hint: Tie a 2mm bead inside instead of just knotting the cord.