Product description Material: metal Size: 5.5 cm 1. Applicable models: Compatible with smartphones with a phone holder for each phone. {TIPS: Please do not use it directly on the glass back of the phone. The anti-fingerprint coating on the glass prevents the adhesive from sticking firmly. It is recommended to stick it on the phone case.} 2. Material: This Product Adopt High Quality Metal, Sweet Modeling, Feeling Comfortable Very Durable, Cell Phone Metal Rings Bottom With High Quality Very Strong Sticker Glue. 3. Function: Can be freely rotated 360 degrees, you can adjust the angle of use as you like, watch movies or send message and more, after installation, can be easily carried on your fingers, avoid mobile phone falling. 4. Tips: It is recommended to stick it on the fixed glossy phone case. Hold the button for 1-2 minutes to help the glue stick. Liquid Silicone Phone Case cannot be used. 5. Super love the beautiful shape and rotatable ring grip stand the full metal material, sturdy stand and tablet stand adhesive, comfortable and safe grip to prevent the device and head unit from falling while using the phone operate and take pictures.