>>8163256>>8163259Armature anon here. That stuff is Jeton ball and socket armature. I like it a lot, but the special pliers to connect/disconnect it are 30$ each and you'll need them for each size you use.
I get mine from this shop
>https://www.ebay.com/itm/M01022-MOREZMORE-Try-3-32-1-8-3-16-1-4-Jeton-Ball-Socket-Flex-Armature/202318870129?hash=item2f1b24f671:g:pWMAAOSwFFZbAtXA