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These zip lock bags have a white writing block. These bags are ideal for a wide range of packaging needs. These bags offer an excellent combination of clarity and quality. These resealable poly bags are made of 100 % virgin Low Density Polyethylene (LDPE) resin that meets FDA and USDA specifications. Available in 2 Mil and 4 Mil thickness. 2 Mil is the most popular thickness for general applications. 4 Mil Zip lock Bags are heavy duty for protecting industrial parts and tools. For large quantities, please call us for a quote.