As found in many high end guitars, orange drops are an industry standard for tone control capacitors.
0.022uf capacitors are most commonly used for humbucker and P90 loaded guitars. They can also be used with single coils for less treble roll off than the typical 0.047uf capacitor. 0.033uf is a middle ground. 0.1uf is used for extreme treble roll off, or for standard roll off with active pickups. Please note our 0.1uf is a high voltage version and is physically larger than the others.
Red drops are exactly the same, but for the colour.