With Hoffmann side wall and modified top beam.
 RuBee windows - our top quality, knot-free and planed
 Wood thickness: Top beam 19 mm thick and 22 mm wide, ears trimmed to 9 mm with a width of 22 mm
 Top part 394x28x19 Bottom part 370x22x8 Side part 223x35/22x8
 glued, stapled and eyelet
 Horizontally wired
 Blade with groove