Covered with Spall coating (The plates are coated with Rhino Extreme HP-50 Isocyanate (MDI Prepolymenr) along with HP-50 Resin which is a polyurea resin.

While the plate must be labeled Level III per NIJ regulations, the plate exceeds the level III protection requirements due to its ability to protect against extra light armor piercing calibers. The sole exception is Dawson's suit, which the Sole Survivor can hack into with the Pip-Boy 3000 Mark IV, after killing him and acquiring his passcode. The majority of sentinel power armors are hostile and will attack on sight.

At only 5mm thick, this is the thinnest steel plate one can own. Sentinels appear as ordinary power armor frames and are able to equip any pieces of power armor. These Star 647 Plates weigh only 6.3 pounds each. The Bulletproof-it Body Armor Stand Alone Ballistic Plate Level III + Shooters Cut Single Curve Spall Coating 10'x12' Star 647 Steel is the lightest Level III+ Steel armor plate available on the market.