When evaluating gear clocks, prioritize the movement type and material durability. Ensure the clock uses a high-torque quartz movement if the gears are large, as standard movements may fail under the weight of decorative hands. For the gears themselves, ABS plastic with metallic electroplating offers a lightweight, cost-effective solution, while cold-rolled steel or aluminum alloy provides a premium, authentic industrial feel. Always verify the noise decibel level; high-quality units should operate at under 20dB to ensure they are suitable for office or bedroom environments.