Sonorlites are a drum made from Baltic birch, but the plys are different thicknesses, that is their claim to how nice and reactive the drum responds. The Natural ones like this one look like either a shellac base or more likely, a sealer, that pre tints the wood and then they add amber or brunt sienna gold to the lacquer finish. The Company is about 40 years old so the drum is 40 years minus. Jazz and Jazz fusion guys like them.