That looks to be a cardboard one, although I can't tell that for sure. However, it uses staples the way the cardboard ones from Ford did. Personally I'd find a plastic one like those used from 2/85 as they hold up better:
E0TZ 1006010-A
80/85 "Before 2/85" F100/350.U150 - - w/integral A/C
E5TZ 1506010-B
85/86 "From 2/85" F150/350.U150 — w/integral A/C
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI
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