Gretsch G9220 Bobtail Round-Neck A.E - 2-Color BurstTone amplified! With its deluxe appointments and Fishman Nashville pickup, the Bobtail Round Neck stands out in the mix in more ways than one. The vital feature of all Gretsch resonator guitars is the all new Gretsch "Ampli Sonic" diaphragm (resonator cone), which is hand spun in Eastern Europe from nearly 99 percent pure aluminium and yields an impressive quality and volume of tone.