1. The OCA tape glue is a highly-specialized film that offers excellent clarity and adhesion to various types of transparent substrates. OCA tapes are applied in transparent applications, such as in displays, touch panels and other devices requiring an optically clear bond. 2. The OCA (Optically Clear Adhesive) is one of the important raw materials for touch screen. Made of no optical acrylic adhesive backing material in the upper and bottom when laminating layer from type membrane,which is a kind of the joint tape substrate material. 3. Professional Installation is highly recommended. Not easy to install. 4. Highly recommend professional installation. We will not be responsible for any damages to your cellphone/mobile phone that you may cause during the changing of replacement parts. 5. Good to fit with your device.