ACDelco 4K355SF Professional V-Ribbed Stretch Fit Serpentine Belt Powers specific accessories on equipped vehicles and is critical to their performance Made with temperature and crack resistant EPDM rubber for a long life and quiet, dependable performance Is the belt of choice by professional technicians, lasting 50% to 60% longer than retail belts Has patented highly engineered EPDM rubber belt ribs that are extremely resistant to oil leaks, wear, and pilling Provides the strength and flexibility of advanced polyamide tensile cord for a longer belt life