As with all Brawn Mfg sluices, they use a unique flared alluvial sluice body design, sports a single nugget-trapping riffle and new louver riffle over carpet to ensure you never miss fine gold again. This patented design allows prospectors to process a surprising amount of sand a gravel. Durable marine-grade aluminum construction for long-lasting performance. Requires assemble of the flair to sluice. The far left sluice in the picture is what will be shipped. Made in USA. Specs: 18' super wide flair top sluice width is 10' bottom of sluice is 13'