Selection А: Homogenous colors. Small knots allowed with maximum diameter of 5mm. No sapwood allowed.
Selection B: Discoloration is allowed as well as knots of up to 25mm diameter. No sapwood allowed.
Selection C: Knots are unlimited in size and number as long as they do not affect the smooth surface. Sapwood and contrast in colors are present.
Instructions for storing, installing and maintenance of solid wood panels you can download from here.