Custom, precision machined, Splice Core PTFE tube set (5-pack). The replacement instructions can be found here.
If you're using a Palette, and live in Canada... this seems to be pretty much one of the few places to get these online shipped without going across the border.
Arrived on time, as advertised, and the person who packaged it for me was kind enough to tape it to a filament box so it wouldn't get lost in the packaging material.
And if you get it, might as well get a few more rolls of filament so you can get free shipping. I mean, come on... why fight it?