Cost-effectiveness of the injection-molding process.
Elimination of machining operations.
Low density: light-weight, low inertia.
Capability to soak up shock and vibration on account of elastic compliance.
Skill to function with minimum or no lubrication, as a result of inherent lubricity
Corrosion-resistance; elimination of plating, or protecting coatings.
Tolerances are continuously less very important than for metal gears, due partly to their greater resilience.