We have had our Rogue Dog sled for at least two years. We decided buy the plastic guards mainly because we workout in a residential neighborhood and the noise was going to be a factor. We slide that thing on asphault day in and day out. The plastic does get scratched up, but we are nowhere close to wearing it out. Plus the more scratched up it gets, the smoother it slides across the black top. The plastic will last longer than you think. Nice looking sled by the way. My DIY sled before we got the real deal was made of 2x4s and galvanized pipe.