Helps dampen & stop vibrations to avoid needles jumping out of the grooves.

*** IMPORTANT NOTE ***

Due to the manufacturing process, some small bubbles will be present on the underside of each foot. This is normal and is due to the type of polymer used and the process of pouring the polymer into the mould. When poured, air bubbles are released and settle at the top of the mould. Also, the type of polymer used has a slight stickiness to it - again, this is normal and is a characteristic of the material used.