Amzer Kristal Tempered Glass HD Screen Guard Scratch Protector Shield for Samsung Galaxy S4 - Retail Packaging The slimmest & stronger HD screen protector than regular. Easy to install with a simple swipe. Its Premium Tempered Glass prevents the glass from shattering. Round edge borders avoid chipping while using it with Amzer cases. Scratch resistant material protect your Samsung Galaxy S4 from sharp objects also like keys, knife etc. Tempered glass technology prevents the glass from shattering while facing heavy impact.