A: Furniture caster, Office caster, Industrial heavy duty caster wheel, Super Heavy duty caster wheel, Extra Heavu duty caster wheel. 3. Q: What kinds clients do you have? A: We have many clients who specialzied in CNC machines, Dolley, cart, cleaning equipment, gym equipment manufacturing etc, well accept our quality. 4.Q: Can you do OEM product? A: Yes, we can provide OEM service. 5.Q: How long warranty for caster wheels? A: All of Unionlever's caster wheels have 1-2 year warranty.