Made of material, can be shortened to adjust size reduction. If you have joint problems, and experience swelling from time to time, ring adjusters are a great way to keep your rings secure without irritating your joints. Feature - Color: Transparent.- Material: tpu.- Size: 10x0.5x0.5cm. Thin round wire 3.5mm + thin flat wire 4mm + thick flat wire 4.8mm + thick round wire 5mm/each 2pcs.- Are made from materials. This means they are both and comfortable, and will not scratch your fingers or your ring.- Come with a screw design that fits more snugly than some of the cheaper designs.Can be used as is, without any extra adhesives, chemicals, or fasteners.- Unlike tube-based designs, the spring/spiral will not retain water or dirt and fits a wide variety of ring shapes and sizes.- Don't lose a ring, or wear an uncomfortable, inferior, ring adjustment product. Keep your ring comfortable.Pcking list: 8 x 8PCS Ring Size Adjuster Ring