polyurethane wheel with central ball bearing

1. Horn: Double ball raceways design, bright zinc plated;
2. Wheel: Black color polyurethane (90~95A) / White core, Grey color thread guards (central precision ball bearing).
3. Suggest to use for many environment, suitable for furniture, retail point of sale. Hospital and carpeted areas. Temperature range: -20℃~80℃
4. Load Capacity: 2":30KG;  2.5":42KG;  3":60KG;  4":65KG,  5":72KG