An air bag deployment door mechanism for the instrument panel of an automotive vehicle. A deployment door is molded integral with the instrument panel retainer and defined by a plurality of closely spaced holes about its perimeter. The spacing between the holes define the physical connection between the deployment door and the instrument panel retainer. A tear initiator is molded into the deployment door which is activated by the inflating air bag. The tear initiator pierces the foam and decorative layers prior the severing of the physical connection between the deployment door and the instrument panel retainer.