Models of electric guitar included the Hagström 1, the H series (h II, h III, h II N), the Swede (Originally called The Hagström LP, or Les Paul, due to the instrument's resemblance to the popular Les Paul manufactured by Gibson Guitars), the Super Swede, the Impala, the Corvette (called the Condor in the US), the Viking, the Swede Patch 2000 (one of the first synthesizer guitars) and the Jimmy (named for Jimmy D'Aquisto, a respected New York luthier brought in by Hagström to design the guitar). Basses include The Swede Bass and the Hagström H8 - the first ever mass-produced eight stringed bass guitar, which found fame when used by the likes of Noel Redding, Jimi Hendrix, Mike Rutherford, and others. Another innovation was the H-Expander Truss Rod, which gives the neck additional strength allowing it to be unusually thin. Thus the action can be set lower than guitar necks built with traditional truss rods.