A pair of Goodyear brake pads (the kidney-shaped, not the round ones) and a pair of the metal clips that hold the brake disk to the wheel. The official pads sold for about $200 a pair, though these are in Aircraft Spruce wrappers and probably were sold for $25 or so.
These were used on older Cessnas, and on older homebuilts that used old Cessna parts. These seem to have become very rare; Aircraft Spruce doesn’t carry parts for them.
They’re free to a good home. Heck, they’re free to BAD home, since I’m going to throw them out anyway if no one wants them.
FREE – Goodyear brake pads