The Helmet Diamond Glass 4D is a tempered glass screen protector designed specifically for the Oppo A57s. Its 4D construction ensures full coverage of the front display, extending seamlessly over the curved edges to provide comprehensive protection against daily wear. This protector is built to be shock and scratch resistant, which helps keep your screen safe from accidental drops or abrasive surfaces. The glass features an anti-fingerprint and dirt repellent coating that makes it easier to maintain a clean surface, while its high optical transparency ensures that the display's original clarity remains unchanged. Because it maintains full touch screen sensitivity, you can navigate your device naturally without any lag or interference.