Trim-able Rubberized Sluice Box Matting Measures 10" wide by 27" Long. Trims Easily to 8" with the guide on the back of the mat. Features Three Proven Riffle Styles: Hungarian, Square style, and "V" Shape Riffles for Gold Recovery in any Environment. Rolls Into a 4" x 10" Roll. Made from Rubberized Plastic Material. Our Gold Panning Kits are Assembled in California, USA by Sluice Fox team of experienced prospectors. Parts sourced globally.