Those are just two totally bamboo in-drawer knife holders inserted into one of my drawers. They are pretty long holders, so make sure to measure first if you ever want to go this route.
I have the Shun 22-slot block, which is the best off-the-shelf block I have seen. Not perfect, but it does have a cleaver slot (won’t quite hold my Sugimoto #6, though).
Yes. They do if the knife is taken off the magnetic strip incorrectly. The piece I have sucks - it has two metallic strips about 3-4mm wide by 18" long mounted on hardwoods.
The knife must be pull directly off or levered away from the edge. It seems like common sense, but I’ve had two very nice knives(prosumer level… Crumpacker and Takeda) which now have hemisphere defects (3-4mm in diameter… ) in the blade when someone unknowingly rolled knife off of strip against the blade.
Magnetic strips would work if they are hidden behind some nice wood as in the post above.
Seems to me that these have to be slowly dulling your blades, or you’d be cutting up the tentacles. I could be totally wrong about that, but that’s what kept me from buying one.