PS-400 Pedal-Sta Vibration Rubber Mat - Non Skid Acou-Spun mat are a closed PVC sponge rubber smooth, one side pebbled embossed finish on the other side. This 1/4" mat is thicker than most, absorbs much more vibrations, quieter noise. It is 12"x15" will fit most all serger and sewing machines. This beautiful mat is used underneath many appliances as well such as juicers, mixers, and laptop computers. Made in USA.