Buff Armor Ultimate Shock Absorbing Screen Protector for Apple Iphone 4/4s Front & Back, Scratch Restant, Premium Hd Clear, Self Healing, Bubble Free, Antistatic and Uv Protection 4-Layered Shock Absorbing Technology Scratch Resistant Layer Shock Absorbing Layer Stretch Resistant Layer Air Bubble-Releasing/ Reusable Silicon Adhesive Layer