This was a new home in Russellville, AR that we did back in the year 2000.   It consists of 4 Inch  #1 red oak with a Provincial Stain.   We did over 2000 square feet of floor in this home and a set of stair treads and risers also.  It turned out very nice as you can see.     This is one of the most common types of floors that we do.   I would say that 4 inch floors are the most common width that we install, and we probably install more red oak than any other species.   Red Oak is very common and there is a lot of matching red oak furniture.   Of course, mixing and matching different types of wood in a home never looks bad.