A solid enclosure of Tape & Reel (TR) surrounds optical attenuator.Shipping overseas is convenient with the RF Attenuator packed in 0805 (2012 Metric).
E-TA2012 T 2DB N2 Features
E-TA2012 T 2DB N2 Applications
There are a lot of Nidec Copal Electronics E-TA2012 T 2DB N2 Attenuators applications.