Check the listing for details. 12Pcs Ring Size Adjuster Invisible Clear Ring Sizer Jewelry Fit Reducer Guard US. Condition: New: Other (See Details). Listed at 6.40 USD. Invisible Ring Size Adjuster for Loose Rings Ring Guard, Ring Sizer, 6 Sizes Fit Almost Any RingSOFT MATERIAL: Ring size adjuster is made of TPU (Thermoplastic Urethane), which is non-toxic and safe to use; comfortable, durable and soft, do not worry about scratch your skin; will not hurt your health and doesnâ€t matter to children.INVISIBLE DESIGN: Unique design, perfect solution to the problem of loose rings. With a transparent TPU material, it blends in with your ring and do not reducing the beauty of your ring.FITS ALMOST RINGS: Suitable for all sizes of rings which width from 2mm to 10mm.Simple to use: Usually used best in one in every of 2 ways. Either place the sizer into the curve of your ring, then slide it on your finger; or, place your ring on your finger and insert sixer between the two.SIZE: This kind of ring has 6 sizes, the ring bottom width that is suitable for you has :XS-(2mm)*2, S-(3mm)*2, M-(4mm)*2, L-(5mm)*2, XL-(6mm)*1, XXL-(7mm)*1.