Our 6 Mil Clear White Block Ziplock Bags are ideal for heavy duty applications where packaged, stored, or shipped items need to be labeled and protected from outside contaminants. These white block Clearzip .006 plastic zip lock bags are perfect for labeling custom orders, indicating manufacturing dates, assembly instructions or warnings, as well as labeling lightweight parts and samples. The 6-mil Ziploc bags with white-block area allows for you to write on the ziplock bags and they accept Industrial Marker, rubber stamp, grease pencil, or pen. The side-welded zipper top white block 6 mil bag seal reinforces the bags zipper for added strength and insures these 6 Mil Ziploc white block bags are resealable and reusable, no matter how many times the bag is opened and closed. All 6 mil white block Clearzip plastic zipper bags meet FDA/USDA specifications for food contact.