3D printers can create excess noise that can be very annoying or worse, highly distracting.
Most printer noise is due to vibration generated by moving parts and motors. This vibration can transfer into any object that the printer is in contact with, such as a desk, workstation or racking. This object then acts like an amplifier for unwanted disruptive noise.
3dB are small anti-vibration noise reduction feet pads that help to isolate the vibration caused by the 3D printers movements and motors.
The low profile gives good stability, hence 3dB does not allow excessive shaking even when printing at higher speeds. Print quality is retained and some print issues can even be improved, such as helping to reduce ghosting/ringing.