Rockin Beads Brand, 500 Stop Beads Inserts Black Rubber Donut Spacers 500 Stop Beads Inserts Black Rubber Donut Spacers Fits European Charm Bracelets Clip Over Stoppers Wholesale Jewelers? Pack Beads are 6mm round Rubber 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 beads but a few folks have used them as spacers without adding the clip