1. PP and Nylon the big difference is the raw material, PP is cheap and also can be have good loading, that is the
advantage, but Nylon with better using life and endurance and loading much better than PP raw material. Nylon
raw material is much expensive than PP raw material;
2. If you choose economic type, its
highly cost effective;
3. If you choose the high quality type, its also highly cost effective because of its good quality but competitive prices;
4. Both of these wheels with steel double ball bearings, not recycle bearing,please note;
5. These casters with hard tread, so it will be noisy when walking, that is the disadvantage, so when you choose this
model, please carefully, its suitable for roughly floor and outdoor using, the advantage of these
wheels are impact
resistant and withstand voltage.