Nik & Sam were featured in the 2012 Gretsch Guitar catalog as part of the rollout of the new Gretsch Roots Collection. Gretsch describes this new collection as:
Journey through nearly a century of great Gretsch history with the Roots Collection of acoustic instruments—an exciting new family of banjos, mandolins, resonator guitars and ukuleles with classically authentic Gretsch designs that transport players to a bygone era well before rock 'n' roll blasted off in the 1950s.
The girls actively endorse Gretsch Guitars. Sam uses the Broadkaster “Deluxe” 5-string Banjo, Honeydipper Metal Resonator Guitar, and the 125th Anniversary Hollow Body Electric Guitar. Nik uses the Rancher Jumbo Cutaway , Rancher Dreadnought and the Rancher Jr. Acoustic Guitars. For more information you can check out Gretsch Guitars.