This is for one ESU Loksound 50337 Loudspeaker (Visaton FRS 5) that is a high-quality analogue loudspeaker designed for use with ESU LokSound 3.5 XL and 4.0 XL decoders. It has a 50mm diameter and 8 ohms impedance. It is in new opened unused condition. I have two available. Any questions just ask.