Is it made of tempered glass or plastic?

It is Tempered Glass and composed of multi layer, in the middle layer is glass which is the main layer.The upper layer is Anti-Scrach coating and Anti-Fingerprint coating layer,which ensures durability without scratching and breaking.

It can't tell it's Glass or Plastic by the appearance , so how can I to identify it?

You can try to ignite the screen protector with a lighter. You will see the shape of the tempered glass does not change after burning. (Plastic will be deformed at less than 300 degrees Celsius. Glass will be softened only at 600 degrees Celsius)

Screen Protector for Garmin Edge 840/840 Solar/Edge 540 Tempered Glass [3Pcs],9H,Anti-Scrach,Anti-Bubble,Easy Installation

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