Trim-able Fine Gold Recovery Sluice Box Matting Measures 12" wide by 36" Long. Easy to Trim to fit your needs. Features mini "V" Shape Riffles for Fine Gold Recovery. Rolls Into a 3" x 12" 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.