The optical attenuator is packaged in Tape & Reel (TR) solid enclosure.The RF Attenuator is convenient to ship overseas because it is packed in a 1206 (3216 Metric).
E-TA3216 T 2DB N7 Features
E-TA3216 T 2DB N7 Applications
There are a lot of Nidec Copal Electronics E-TA3216 T 2DB N7 Attenuators applications.