Genuine Krytox XHT-BDZ grease, repackaged into a leak-proof glass jar.
Each jar contains 10 grams of lube. That's a lot and should last you for several keyboard builds.
This is the best choice for eliminating all stabilizer rattle and ticking. Its extremely thick consistency and high viscosity provide outstanding dampening properties and make it stay in place incomparably better than dialectric grease (e.g. Permatex) and other Krytox lubricants (including the most commonly used 205g0), so you will never have to re-lube your stabs.
The large quantity of lubricant in the jar makes it easier to dip and evenly coat the stabilizer wires (in case you prefer this application method).
NOTE: Use it only on the wires, and remember: a little goes a long way. It's very easy to go overboard with this stuff, resulting in overlubed stabs that feel sticky and sluggish.