High Quality Ultra Slim Materials - Zinc alloy metal material plate is thin,Quality zinc alloy material plate with smooth ring part,could protect your finger when use.Usage Method:1. Wipe away dirt, dust on the back of your phone, dry it completely.2. Peel off the protective paper. Do not touch the adhesive surface.3. Press the ring holder against 15 seconds.4. After 3 hours hanging heavy, the effect is much better.Notice:Please do not pull the ring stand after you stick it on your phone, because the 3M adhesive is not sticky enough within the next 3 hours.Package included:1 x Finger Ring Holder