Smart beads are lined with a silicone compound that grabs on and makes them stay where you put them. New design ideas galore. Use it to keep that single centered bead centered. All kinds of ideas. Try on wire or on chain! Will hold securely to wire/thread/chain with a min. diameter of 1 mm and max 1.3 mm. Also called slider beads or rubber filled beads.
6mm Hole size is approx. 2mm. By the each.