The ring size adjuster is made of elasticity transparent plastic material, it is comfortable, durable, invisible, don’t worry the ring scratch your skin. You just spiral wrap as much as you need and then cut it off. It is a great gift for your lover, family and friends. Feature - Color: Transparent. - Material: Plastic. - Size: About 10.00X0.50X0.50cm/3.93X0.20X0.20in. -Type: Thin round wire: 3.5mm; thin flat wire: 4mm; thick flat wire: 4.8mm; thick round wire: 5mm; Each size comes in 4pcs. - Are made from quality materials. This means they are 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. - Never need to worry ring adjuster for would scratch your ring. - Easy to use these ring size adjusters and the ring fitter will not come off whenever you take off the ring. Package list: 16 Spring Ropes