Looks like A-grain balsa. Not surprised it bends so nicely. It's usually used for leading edge sheet and planked/sheeted fuselages for this very reason.It always amazes me how much you can bend balsa. This fuselage wing support has to be twisted drastically to mate up with the bulkhead.
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After soaking the piece in glass cleaner with ammonia for about an hour it twisted easily and smoothly without cracking.
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I need to mention how amazing the laser cuts are in this Herr kit. The cuts are extremely thin and there is remarkably very little scorching of the wood.