Satin Gold Color 1.5mm Oval Bead Bumpers by Beadalon. ID is 0.5mm (0.019"). Use Bead Bumpers instead of knots to separate and add interest to designs. Simply string one Bead Bumper in between each bead of a design to space beads evenly. Once incorporated, the Bumpers look similar to a knot and keep the beads from rubbing against one another. Since Bead Bumpers are made of a special stretch material, they can be added to Beadalon wires up to .024” in diameter.