AMZER ShatterProof Screen Protector is super thin urethane film at only 0.2 mm thick, ShatterProof certified by the ASTM (American Society for Testing and Materials) having passed D1004 Tear Strength, D2240 Hardness and D4329 UV Light Discoloration Tests. The protector is scratch resistant, stress resistant, drop resistant and has a special self healing capability with dissipative functioning embodied - it is virtually indestructible making your Samsung GALAXY S4 unbreakable!. The AMZER ShatterProof Screen Protector is a revolutionary product innovated to provide the best protection to the next-generation of wireless devices. AMZER ShatterProof Screen Protector’s extreme grade protection making the Samsung GALAXY S4 shatter and shock proof. ShatterProof has a unique shock dissipative function - unlike any other product in it’s category - ShatterProof uses the physics concept of dissipation, dissipation embodies the concept of a dynamical system where important mechanical modes, such as waves or oscillations, lose energy over time. ShatterProof does exactly the same to protect devices from drops and shocks, drops and stress which wireless devices usually don’t survive - which is why the name ShatterProof.