1. These vibration dampers are suitable for 3D printer and other machine adopted NEMA17 stepper motors2. Each package contains 12 pieces screws for you to use, enough for you to use and canprovide a lot convenience in the process of using3. Nema17 Stepper Dampers are used to decrease noise and resonance in your CNC and3d Printer, eliminating vibration and effectively improving 3D printing quality4. 1 Damper used per Stepper or Electric motor5. 3D Printers see a 5-10dB reduction in noise when used on X and Y Axis steppers with thevibration damper for nema 176. Works on both Cartesian and Delta style Additive Manufacturing machines such as CR-10Pair these with good filament for the best results in your 3D printer and remove vibrationand noise