100% American made, a vibration mat to keep sewing machines and serger machines in place, keeps noise down and stable. Acou-Spun mat are a closed PVC sponge rubber smooth,one side pebbled embossed finish the other side. This 1/4 inch: thicker than most, absorbs much more vibrations, quieter noise. This 12 x 15 will fit most all serger machines, sewing machines. This beautiful mat is used under neath many appliances such as Juicers, mixers, even laptop computers. Lifetime warranty made in the USA.