Kevlar corded belts, also called Aramid or extra-heavy duty belts are constructed of organic polyaramid fibers that are manufactured using complex chemical processes. **Interesting fact: Kevlar is the same material bulletproof vests are constructed with. Kevlar is used in PIX belts as a tension member because of its inherent stability and high tensile strength Cord – To ensure this part goes with your machine you should always go by the model number and serial number, which is normally found under the seat of your riding mower or on the deck on a walk-behind. If you have a John Deere, the model number is on the side of the tractor, and will also be printed on an identification tag located below the operator’s seat or on the back of the lower frame between the rear wheels. The serial number (PIN) is 13 or 17 digits long. If you have a Hustler, the model and serial number decal is located on the frame directly below and to the left of the operator’s platform or on the left frame side rail.