This 20cm/7.87" square one covers the 8" heating element or burner.  

It protects the induction or electric cooktop surface from scratching and scorching.  Very durable.  We'll move to a gas cooktop place, so we won't need this.  

Material: Clear Crystalline Glass.  Heat Resistance:  700C.  (Info from the package.)

Dimensions:  20cm X 20cm X 3mm; Weight: 10.7 oz

Comes with a spatula to move the cover from heating element.

Brand:  Takagi Metal