PRODUCT MATERIAL:ABS, TPUPACKAGING MATERIAL:pvc+color cardHOW TO USE:Clean the back cover of your product, tear off the ring bracket protective film, then press it onto your phone. Leave for 3 hours before use. Expend it while using; When not in use, push it back to store.FEATURES: 1. Small and easy to carry, adjustable length, after expanding can be used as a phone stand; 2.Earphone cable can be wrapped around it. 3. Contains magnet making it easier to get attached to car phone holder.PRECAUTIONS:Not applicable for product covers made of leather, cloth, and rubber, or in the shape of curves, uneven or matte surfaces.STORAGE METHOD:Keep away from fire and humidity. Store in a dry and cool place.