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