We used American Walnut and Maple in the process of making this puzzle.
It measures 60mm x 60mm x 60mm.
The difficulty is move: 23(15.6.2).
Christoph Lohe wrote about this:
"With just three sticks of length five, densely packed into a cubic
frame, the Closed Box is not the most difficult puzzle, but all but
trivial to solve. It requires 15 moves to release the first stick, and
it displays nicely with six closed sides. I am very happy to see it
made in a high-quality Deluxe version with outstanding wood
craftsmanship."
by Christoph Lohe
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Review starts at 4:37