G9210 Boxcar™ Square-Neck Resonator Guitar More powerful than a locomotive! This square-necked version of the 1930s Gretsch classic has the tone and punch demanded by pro players. The vital feature of all Gretsch resonator guitars is the Gretsch Ampli-Sonic™ diaphragm (resonator cone), which is hand-spun in Eastern Europe from nearly 99 percent pure aluminium, yielding an impressive quality and volume of tone. Optional gig bag available (#099-6481-000).