They are designed to prevent drivers and passengers from being completely ejected from a vehicle by spreading out their bodies’ energy over their shoulders, chest, and pelvis in a collision. Repair services typically involve removing the old, worn, or damaged webbing and replacing it with new, OEM-quality seat belt webbing. http://www.drugoffice.gov.hk/gb/unigb/www.ledteks.com/seatbelt-and-safety-belt-webbing