Specification:Compatible Motor: 555 DC motorMaterial Type: Durable white plasticPulley Length: Approx. 25–30mmInner Hole Size: Optimized for 555 motor shaftOuter Diameter: Standard fit for small pulley systemsUsage Type: Motor rotation transferBuild Quality: Lightweight and durableInstallation: Easy push-fit on motor shaftApplication Type: DIY motor mechanismsWeight: Approx. 1g (each piece)