There is a Bulk solid enclosure around the optical attenuator.Due to its 0805 (2012 Metric) packaging, the RF Attenuator is convenient for international shipping.
E-TA2012 6DB N7 Features
E-TA2012 6DB N7 Applications
There are a lot of Nidec Copal Electronics E-TA2012 6DB N7 Attenuators applications.