Ring Size Adjuster Set (Pack of 4) Never worry about loose rings again. This set includes four clear silicone ring sizers in both round and flat designs (3.5mm and 5mm diameters). Each 10cm strip can be easily trimmed to fit any ring, providing a secure, invisible, and comfortable adjustment. Perfect for resizing without damaging your jewelry, these soft, flexible adjusters ensure your rings stay snug and slip-free all day.