Large riffles the gold much like the riffles in a sluice box, leading to a faster panning process letting you process more pay dirt. Gold Pan incorporates both and shallow riffle side wall, allowing better separation of gold from other heavy minerals similar to a sluice box. Riffle Technology allows for all sizes of alluvial gold particles to be efficiently collected without missing any fine specs. 4 different colors, black/blue/green/for blue, diameter: 38cm/15-inch. Molded from high ABS this gold pan is light weight, rust-free, resistant and floats., Manufacturer: Xinsheinelry