The Metallic rolls are totally lightproof and secure. Light can damage food, and can detract from the potency of herbs and medicines. Your privacy is also secure and protected with light and odor-proofed Shield N Seal all-black heat seal rolls. Don’t forget to reuse your rolls! Just trim off the rough edge, and reseal. It’s simple to save money not only saving money on food but also on the bags themselves. Shield N Seal rolls feature a honeycomb channel system that makes them compatible with most sealers that are 8″ or wider. We recommend using our Sealers for the strongest, thickest seal, but our rolls can be used with a variety of systems. (pack of 2)