5 X NEMA 17 Motor Vibration Damper for CNC 3D Printer Stepper Motor Descriptions: These dampers  are used for reducing stepper motor noise and vibration. Excellent anti-vibration dampers for quiet stepper motors.This item included 5 pcs dampers, and made of metal and rubber, durable in use. Features: These dampers are used for reducing stepper motor noise and vibration. Excellent anti-vibration dampers for quiet stepper motors. Suitable for CNC 3D printer stepper motor. These dampers are effective to reduce shock. These energy- absorbing rubber mounts with a metal mounting face. Stepper motors are affected by resonance. Resonance is caused by parts vibrating in concert with each other, which can be lessened by fitting a stepper motor anti-vibration damper. This item included 5 pcs dampers ,and made of metal and rubber, durable in use. Specifications: Material:metal, rubber Quantity: 5 Size: as the picture  Hole diameter: 9.5mm/0.37inch Weight: 96g Package Included: 5 x Motor Vibration Damper Note: The style is random