25 single-layer gears with 25 different types of single-layer gears, all standard and common. The gears are all 0.5-modulus plastic gears, and are single-layer circular gears, generally used on axles, with a variety of different apertures.
[product material]: POM plastic (very wearable)
[Scope of use]: Transmission hook for various DIY hand-made products
[Gear Modulus]: The modulus is 0.5, all can be used together.