Rockin Beads 500 Stop Beads Inserts Silicone Rubber Donut Spacers Clip Over Stoppers 500 Stop Beads Inserts Silicone Rubber Donut Spacers Fits European Charm Bracelets Clip Over Stoppers Wholesale Jewelers? Pack Beads are 6mm round silicone Donuts with a 2.9mm stretchable hole We have tryed them on Troll, Pandora, Dione and 2 different Knock of chains These are ment to use under a clip over stop bead