2 pieces Replacement back cover sticker Battery back cover adhesive for Samsung S7 edge It is Double Sided and One-off Adhesive. When assembling the phone, the back cover can't be reinstalled tightly because the sticker is disposable. Under such condition, a new back cover sticker is a must-have item to assemble. It is used to attach the back cover to the phone when you replace back cover, change the broken screen or remove unworked components and then reassemble your device.