Each door has a convex cylindrical anti-collision column, which is glued. Stick this plastic modified car door crash pad on them to protect people from injury during driving.

The inclined column between the front windshield and the front door is called A-pillar, the inclined column between the front door and the rear door is called B-pillar, and the inclined column between the rear door and the rear windshield is called C-pillar. In the event of a frontal collision, the A-pillar with high enough strength can effectively avoid deformation, thus ensuring that passengers can successfully open the door to escape after the accident. B-pillar can ensure the safety in side collision, and C-pillar is to strengthen the rigidity of the roof and the whole vehicle.