Safe TPU material: Our ring size adjuster is made of high quality certified TPU silicone. TPU is used in medicine and therefore is completely safe for health and causes no irritation whatsoever. The ring adjuster is suitable for sensitive skin, durable, soft and easy to apply. Fit most rings: 4 sizes of ring size adjusters included - this ring size adjuster will make your ring smaller without resizing. Moreover, it fits both women and men. jewelry. Virtually invisible on rings: The silicone ring sizer adjuster is completely see-through and leaves no doubt about visibility; however, it is there accomplishing its mission. It is also made from memory material and will not get loose on your ring or stretch out, it will always keep its initial form. Multi-purpose ring adjuster: This small ring size adjuster is a useful and practical solution for issues like loose or oversized rings. You can also use this ring tightener to combine multiple thin into one single piece. This ring size adjuster is specifically designed to secure your rings, so you never need to worry about losing them. Easy to use: Simply wrap the ring size adjuster around the back of any ring band. The more loops you add to the ring, the tighter it fits. Trim the ring adjuster according to your need.