Fangrui Product Details 1. 50 Pcs Oca Optically Clear Adhesive For Apple Watch Series 1 2 3 42mm 2. 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. 3. 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. 4. Professional Installation Is Highly Recommended. Not Easy To Install. 5. Highly Recommend Professional Installation. We Won't Be Responsible For Any Damages To Your Cellphonemobile Phone That You May Cause During The Changing Of Parts. 6. Perfectly To Fit With Your Device. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.