BOPP (short for biaxially-oriented polypropylene) is a versatile material that we've backed with a general purpose, permanent adhesive. This material is resistant to water and oils and is particularly suitable for bath and body products as well as food containers. Our white BOPP labels are .0026" thick - please note they are not 100% opaque, so in some cases, high-contrast text may still show through. With our .002" thick clear BOPP labels, only the printed text/graphics appear, making this material ideal for window applications.