Accidental drops and scuffs are inevitable when you use your smartphone every day, so be sure to plan ahead by adding tech21's Impact Shield Self Heal protective glass to your iPhone 7. BulletShield protection Advanced protection in a smartphone screen shield is made possible with tech21's BulletShield, same material as used in bulletproof glass, and the multi-layer structure. This ensures it's highly efficient at absorbing impact force to keep your screen well protected throughout its lifetime. Self-Healing surface /. tech21 designed Impact Shield Self Heal with a reflowing polymer surface layer that smooths over day-to-day scratches, leaving your screen smooth and crystal clear. Bubble-free application The semi-liquid polymer base layer self-adheres to your screen, delivering a one-touch bubble-free application. For full protection, Impact Shield works with most tech21 cases (sold separately).