Description from cubicdissection :
"I noticed a lot of
interesting board and stick burrs coming out on Ishino's site so I
decided to make batch of them. After looking at a couple dozen designs I
chose six for their rpresentation of the various concepts and levels of
difficulty.
Believe it or not, this is the simpler iteration of the Quads and
Rings series. Four wooden burr pieces interlock with two acrylic pieces
with a level 13.5 solution. Doable dispite the high level because a lot
of the moves just follow. Achieving the checkerboard pattern is a second
challenge.
Construction is excellent, with close tolerances but plenty of room to maneuver"
http://archive.cubicdissection.com/html/qnr1.html
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For multiple items, combined shipping is available.