Vasnm Apple I Phone 4s Toughned/Tempered Proof Glass. Guideline: 1. Ensure Dust, Oil Stain And Dirt Are Removed By Rubbing The Screen Mildly With The Cleansing Cloth. 2. Detach The Electrostatic Film And Immediately Place It Over The Screen. Apply Some Force. 3. When They Are Completely In Contact, Remove The Electrostatic Film. Note: For Inexperienced User: 4. Tear Off The Sheet 1 Of The Practice Film About 1 Cm. Avoid Touching The Protector Film. 5. Place The Sticking Face Down On The Screen And Align The Edges Properly. Then Peel Off Sheet 1 Completely While Pressing The Protector Against The Screen. 6. In Case Of Any Air Bubble, Press And Push The Air Bubble To The Edge With Fingers Or Card. "Note: If You Need To Remove: 7. Stick The Film Remover Tag At One Of The Corners. 8. Detach The Protector Film By Lifting From The Corners. Store At Cool And Well-Ventilated Place. Avoid Direct Sunlight. Room Temperature And 60% Rh Or Below. Stricly No Burning.