Xylem custom guitars and basses are made in Colorado. by Luthier Anthony Olinger. Ollinger was a Les Claypool fan and bass player who started making instruments while still in college. He started Xylem Handmade Basses and Guitars in 2007 and set up a workshop in Durango, Colorado.  Olinger is careful to ensure the comfort and playability of his instruments and they are also more lightweight than many mass produced guitars & basses.