Upgrades with turntable mats dramatically improve the sound quality of your records. Absorbs vibrating energy to allow needle to touch the records groove better. The delicate bonding of diamond chips and grooves is very important: the Hudson Hi-Fi acrylic mat improves dynamics and provides a neutral “see-through” sound quality. The mat produces a fresh, modern look, improved midrange, toned bass response, and unflashy sound. Fits any 12″ platter turntable Rigid mats are 3mm thick and require minimal adjustment for vertical track angles. The playing surface is very smooth and the label recess perfectly supports the record The back is as smooth as the front side, and is ideal for setting arm bias (anti-skate). Simply place the needle and adjust until the arm is held in the same place without moving toward the center or edge. This will not damage the needle, and is probably the most accurate way to put bias on the tone arm. Reflective Blue Clear Edges Proudly designed and manufactured in the USA by Hudson Hi-Fi Ships in LP envelope with protective cover. Dimensions: 11.75″ H x 11.75″ W x 3mm D **Shipped with a removable protective film to prevent scratches.