In 2014 Alvarez introduced the Masterworks Series featuring all solid wood construction and high end appointments such as gold tuners, ebony bridge pins, mother of pearl inlays and maple or koa binding. In 2019 Alvarez introduced bluegrass focused Masterworks models, the MF60OM and the MD60BG, that feature construction that emphasizes response when playing with a plectrum and flatpicking. Alvarez Yairi guitars are a\ handmade flagship series, crafted in the Yairi factory in Kani, Japan.Alvarez Yairi have been the guitar of choice for many professional touring musicians including Jerry Garcia, Bob Wier, Ani DiFranco, and Joe Bonamassa.Alvarez Yairi take the name of master luthier Kazuo Yairi(1932-2014) who partnered with St. Louis Music in the late 1960's to bring Alvarez Guitars to the market. Kazuo Yairi inspired many innovations that are still used in Alvarez guitars today, including the Direct Coupled Bridge, careful selection of tonewoods, and manual carving; a practice that he referred to as "listening with your hands".In 2017 the Alvarez team discovered a lost cache of Honduran Mahogany that Kazuo Yairi had purchased and stored on a plot of land near his factory in the mid 1970s.Tonewood that has been naturally seasoning for this amount of time is coveted by luthiers around the world, and this discovery led to the release of the Yairi Honduran line of guitars which debuted in 2018.