These solid oak panels represent a very classic French-style pattern known as the Versailles parquet which can give a palace style to any of your interiors. They look as though they have been reclaimed from an old French castle, e.g. they show the marks of removed nails.
The pieces of the panels are assembled by mortise and tenon, no glue is used, and can be fitted by tongues and grooves. These panels of 15 or 20mm thickness exist in the traditional size of 102x102cm, but can also be reduced to 70x70cm, and are connected with an intermediate plank.