1. In this series you may see three different TPR standard casters, Normal one, standard one and high quality one.
you can choose the different quality casters based on your using environment.
2. Normal one: The wheels with normal steel double ball bearings, and the TPR quality is normal, Silent effect just ok,
and also the endurance is also just so so, not good enough. And the loading capacity for each caster also a little bit
lower than other two models.
3. Standard one: The TPR wheel with high quality material and one steel ball bearing inside, the bracket is same as
the Normal one ,also 304 stainless steel material.
4. High Quality One: The TPR wheel with high quality material and one steel ball bearing inside, the bracket with bigger
offset, so its much easier to push, and this fork with mirror polished, better than the other two cheaper model.