Ultra Master Lutz Spruce, classical 7 1/2 x 3/16 x 20 Kermodie Lutz is a uncommon spruce coming from Northern British Columbia, Not all spruce from this area is Lutz, but ours can be traced back to the stump with GPS numbers and government contract harvesting permits.  Most Other vendors buy logs from loggers and have no idea where the wood was cut. Most Spruce in this area is Sitka, and most wood sold from here i Sitka being sold as Lutz but without the stiffness and tonal quality that only true Kermodie Lutz can offer you. Guitar grade Kermodie Lutz Spruce , you can expect the worlds stiffest spruce, most of our tree are tested by world famous luthier Brian Burns of Fort Bragg and we can supply all the Q factor numbers per request. we are a true green harvesting company supplying only trees that we have found and removed for blowdown or logging residue Salvage  and never ever cut standing green or buy from loggers.