(2020.01.27) 6Brothers have been updating their website with some English subtitles and some sparse translations. They've also organized their product sections so non-Koreans can more easily find stuff. The ordering and shipping sections are still under construction and very difficult to navigate if you don't read Koran or have the chops to run efficient translation software.

I could post some links but visit the site and poke around for a while. Cool stuff, very different from the standard Japanese influences most of us recognize and seek in our go equipment. I enjoyed seeing how different cultures approach solving the basic functions of go/baduk/weiqi: a board, some stones and a pair of bowls to hold them.

Start here:
http://6brothers.net/product/list.html?cate_no=118

You will find table and portable boards, remarkably huge go boards, boards carved into and out of tree trunks, go furniture for clubs, magnetic teaching aids, sets for children and schools, ornately carved and painted boards, shell and jade stones made locally, hundreds of unusual bowls, and some odd baduk accessories I've never seen before.

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David Bogie, Boise ID
I play go, I ride a recumbent, of course I use Macintosh.

how is their quality? I mean, the boards look nice, but how about their quality?

Top quality.