This is the Behringer SYSTEM 100 173 QUAD GATE/MULTIPLES. An authentic reproduction of the original “System 100M” circuitry from the 80s that can fit in a standard Eurorack case. The best part? It’s at a very affordable price. Mix the 173 QUAD GATE/MULTIPLES in with your existing rig to expand its capabilities and you’re sure to have a lot of fun.