These 3" x 4" 4-Mil Whiteblock Reclosable Plastic Bags with Hanghole feature the color red line, which stands for the highest quality plastic resealable bags in the packaging industry. The 3 in. x 4 in. 4 Mil Whiteblock Minigrip with Hanghole Reclosable Bags are perfect for label your medium to heavier-weight parts or samples such as hardware or sharp-edged components for packaging and storage. Mini Grip white-block bag accepts marker, rubber stamp, grease pencil, or pen. These mingrip whiteblock plastic 3x4 .004 Mil Reclosable Poly Bags are manufactured with 100% virgin resins, meets USDA / FDA requirements for food contact.