1 striped
2 striped
3 striped

Character: Unclassified quality. Colorful material featuring smaller knots and expressed textural figuration. There are significant variations in grain but only moderate variation in tint between individual lamellas.
Knot: Knots having a diameter of up to about 5 mm are permitted.
Sapwood: Inconspicuous sapwood is permitted.

Character: It features some bigger knots, and rather dynamic colors and graining but without harsh color variations, with lamellas having some tint variation. Only minor flame pattern is permitted.
Knot: Healthy, well intergrown knots in sizes of up to 15 mm Ø, and black knots in sizes of up to 5 mm Ø are permitted, also in groups.
Sapwood: Fundamentally, it is not permitted, but healthy tangential sapwood, up to 3 – 4 mm in width and 5 – 10 cm in length, is permissible.

Character: It is characterized by the sapwood and the knots, as well as its prominent textural and color variations. Flame pattern is permitted.
Knot: Healthy, well intergrown knots in sizes of up to 15 mm Ø, and black knots in sizes of up to 5 mm Ø are permitted, also in groups.
Sapwood: Healthy sapwood is permitted up to about the 1/3 of the lamella width.

Character: Its color is defined by the natural growth of the tree – with darker and lighter slats. Without any particularly striking, harsh textural and color variations.
Knot: Healthy knots up to a diameter of 3 mm, and dark knots up to a diameter of 1 mm are permitted, except for those in groups.
Red heartwood: Not permitted.

Character: It is characterized by accentuated colors, particularly the red heartwood, and the knots and a vivid texture.
Knot: A healthy knot, up to a diameter of 10 mm, is permitted.
Red heartwood: Dark tone and red heartwood is permitted even across the whole width of an individual slat.