RinGuard Ring Size Adjuster with Jewelry Polishing Cloth (Set of 3 Sizes) US Made using Hypo-Allergenic Surgical Grade PVC Tubing Innovative, spiral-based design provides a long-lasting and snug fit for most rings Prevents water-retention and contaminant build-up 3 sizes included fit most rings, no adhesive, chemicals or fasteners required Stays on for longer and is more comfortable than other ring size adjusters