Top portion is finished with water-base urethane; bottom with oil-modified polyurethane.
Color: Dark reddish brown.
Grain: Striped figuring in quartersawn selections; texture is even and very fine.
Variations within species and grades: Moderate color variation.
Hardness (Janka): 2200; 71% harder than Northern red oak.
Dimensional Stability: Above average (change coefficient .00238; 36% more stable than red oak).
Sawing/Machining: Moderately difficult due to hardness; carbide tooling recommended.
Sanding: Sands satisfactorily.
Nailing: Good holding ability.
Finishing: No known finishing problems.
Comments: Some respiratory allergic potential.
Information is from The National Wood Flooring Association
"Wood Species Used in Wood Flooring"