Glass Lid Material: float glass. Glass color:clear,white, green, ... hole diameter drive arbitraryTesting:1 heat test: put glass lid into oven temperature to 200 °, and constant temperature for ... from 1.25 metres in free fall in glass lid 1/3 radius, so after three times over without ... there is not turn to yellow, dark on the glass lid , without loosing phenomena and deformation.Function:Our new products ...