Description Sentinel 5-10 mil White Opaque Low-Melt 3″ Core Sentinel 5 mil White Opaque Low-Melt 3″ Core. Sentinel White Opaque display backer is a rigid material specifically designed for pop-up and display applications. It is available in both low melt and pressure sensitive varieties. Offers 100% dead white opacity that gives wide format printers the option to produce images without light transference.
