Door Hold Open Release Instructions - School Bus Decal StickerSpecifications Manufacturing: Die cut Pre Spaced Vinyl Lettering Base Material: Black High Performance Calendared Vinyl Backing: Pressure Sensitive Adhesive Properties: Flexible and Durable, Easy to apply Description This decal is used on School Bus emergency doors equipped with Hold Open Mechanism. Hold Open Devices are those that lock the door in an open position when fully opened, then unlocked when moving the door to the fully opened position once