Noise reduction: The noise level is significantly reduced compared to commonly used bearings. Maintenance-free, no lubrication. No dust, moisture or dirt issues. Dimensions: Inner diameter: 8 mm. Outer diameter: 15 mm. Length: 24 mm. Made of plastic material, it is lightweight, can reduce the load during the operation of the 3D printer, and has good wear resistance. Designed specifically for 3D printers, it is compatible with the bearing seat of the 3D printer to ensure that the printer is stable and reliable during operation.