This auction is for a used Modulus 4-string bass. Not sure what model it is, but it's very much like Modulus's version of a Zon Sonus Special. It's shows some wear, but it plays great and I just had it tuned up by a guitar tech (new volume pot). Comes with Zon hard shell case, which is a bit old, but still works fine. Please review my feedback and feel free to ask questions.