The front glass plate / cover is for Profoto flat fronted monolights. It’s available in different coatings: one standard frosted, one UV -300K, one UV -600K for an even, diffused light and one clear option for a harder and crispier light. They all give warmer or colder light characteristics.

Front glass plate for
— Pro-D3, Pro-B3
— D30
— B30 & B20
— D1, D2, B1, B1X

Note that the Glass Plate for Flat Front is not compatible with the B2.