Hi, I am Jessica, today let me introduce you to our new design medical caster. That is. This one is the old model. What is the difference between the two? Obviously, the new model cover is more good-looking than the old model. We ensure you medical casters you get from us are unique, especial in the market. Are you curiousness what it looks like inside the cover here is it. We promise caster wheel are made of all new material rubber is elastic rubber, good resistance. We choose the best quality bearing. If you want our professional caster, we will be your best choice.