RingShrinker: Ring Size Adjuster, Ring Size Reducer, Ring Guard with UV Flashlight Fast - RingShrinker Resin cures within 3 minutes with UV light (provided) Easy to apply ring sizer (brush in bottle like nail polish) Invisible - Applied only to the inside of the ring Comfortable and Durable (best for rings 3mm wide or wider) Safe for all metals. 100% Satisfaction Guarantee!