The ASR Outdoor 8pc Mini Classifier Sifting Screen Set are a must-have for gold prospecting, gold mining and mineral recovery. Utilizing our high-impact classifier screen sieves is one of the first steps in successful gold prospecting by reducing down your material into a manageable size. The Gold Rush Prospectors Mini Classifier Sifting Screen Set will aid in your recovery efforts by sorting your raw material quickly and efficiently. Available in 8 different sizes for both fine and coarse material sifting, you can piece-meal your own set together or purchase the complete set, ensuring you have the right tools at your disposal in order to be able to properly sift and separate your material. These sand and gravel screens are made of tough, high-impact plastic and 304 stainless steel wire mesh. Since each classifier is only 6" in diameter, it's great for beginners, stores easily and is stackable. Although gold is heavy, small flakes will not be able to displace larger rocks from your initial sample. Screening or classifying material into groups based on size will ensure that any gold, whether nuggets or flakes, will not get lost. In addition, looking through similar sized materials is a faster and more effective way to sort and will speed up the panning process, resulting in more gold. Soil Screen Sieve Sizes: 4 holes/Inch, 10 holes/inch, 20 holes/inch, 30 holes/inch, 40 holes/inch, 50 holes/inch, 60 holes/inch, 100 holes/inch. WARNING: This product can expose you to chemicals including bisphenol_a_(bpa), which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to: www.P65Warnings.ca.gov