Tape & Reel (TR) solid enclosure protects the optical attenuator.The RF Attenuator can be shipped overseas conveniently because it is packaged in 0805 (2012 Metric).
E-TA2012 T 9DB N4 Features
E-TA2012 T 9DB N4 Applications
There are a lot of Nidec Copal Electronics E-TA2012 T 9DB N4 Attenuators applications.