Our 3″ x 5″ 2 mil Ziplock Bags with White Block are made of virgin polyethylene and have a center white block to write on the bag. The White Block feature makes it convenient to easily mark and label the bags’ contents and keep track of small items like spare parts, screws & washers. This 3 x 5 inch(es) resealable poly bag with white block features a high quality zipper at the top of the bag. The ziplock is easy to pull or snap open and pinch shut, protecting its contents and making it ideal for storing and packaging your goods. 3×5, 2 mil (.002 inch thick) Write-On bags are commonly used to package Food, Jewelry, Pharmaceuticals and general home & office supplies.