High-Fidelity Audiophile Acoustic Sound Support, 12" Acrylic Turntable, 3Mm. Package contents: a 12 inch Turntable Mat Size: Diameter?295mm Thickness?3mm Function :Provides tighter bass response?Record label recess in the center?Less splashy sound The pad reduces friction damage between the turntable and the record when playing vinyl records, as well as other unwanted resonances. Prevents static, reduces impact, prevents vinyl from scratching, and provides a quality listening experience with tighter bass response. Scope of application: Suitable for players and turntables to extend the service life of vinyl records. Note: Due to manual measurement, there may be an error of 1-3mm.