Rubber bellows and grommets serve crucial roles in car doors and jamb switches. Bellows are used to seal gaps in car doors, protecting internal components from dust, water, and debris, enhancing the door's weather resistance. Grommets are utilized in jamb switches, providing insulation and preventing electrical contact issues. These rubber components ensure proper functioning, safety, and longevity of car doors and jamb switches, contributing to a reliable and comfortable driving experience.