15x11 ‘Sugar cube’ speaker, for DCC sound use. They are 8 ohms to work with TTS, Loksound 4, 5 and Zimo decoders.
They fit the speaker tray on Roco models such as the Vectron and Taurus and line up with the speaker contacts on the under side of the PCB. They have a self adhesive gasket to connect them to the speaker enclosure which is already in the model. HO models require 2 of these.