This is a Roland GK-2A divided pickup for guitar.

The GK-2A is a slim divided pickup for virtually any steel-string electric or acoustic guitar. The pickup sends an individual output for each string, allowing connection to various guitar synths and GK effects. The GK-2A is a well-constructed unit which can be attached or detached at any time.
  • Divided pickup for use with VG-88, VG-8, GR-33, GR-30, GI-10, BOSS Twin Pedals and other 13-pin compatible products.
  • 3-position switching between synth, natural guitar or mix of both.
  • Mounts on any steel-string guitar (electric or acoustic).

NOTE: The GK-2A has received more favourable reviews and stood the test of time better than the GK-3.

Roland GK-2A Hex / MIDI guitar pickup synthesizer driver
For use with 13-pin cable and any compatible guitar synth.
All functions in good working order.
A little adhesive residue on the back.
Comes with guitar jack to lead and some original spacer bars for mounting.  All included parts pictured.