Turntable mat enhancements include a major increase in sound recording quality. SlipMats are an excellent way to boost the turntable playback experience as the sole point of interaction between a record and a turntable platter. In a peculiar way platter mats absorb vibration energy effectively allowing a stylus to make closer contact with the grooves on a record. Notice that according to the turntable it lies each platter mat has a separate sound process. Features: sound stage and proportions Lay. Features: Soundstage and Measurements Record Label Recess Precise machined.5mm record label recess to ensure that the record lies flat on the mat. Soundstage Neutral see-through sound quality with better dynamics Tighter bass response Less splashy sound Increased mid-range Measurements Thickness: 3mm Diameter: 11.75 Compliant with all turntables. Suitable for regular 12 turntable surfaces. Note: You can also use this item to set the bias of the arm (anti-skate force) The flip side is as smooth as the top face and is perfect for setting the bias of the arm (anti-skate force). Simply put the stylus on it and adjust until the arm stays in the same spot and doesn t move into the middle or the edge. This would not harm the stylus and is perhaps the most accurate way to set the bias on your tonearm.