The caster is designed based on America's style so at first glance it's not so bad. But if you look closer, the Zinc coating is just so so, bracket steel & PVC wheel is not good and sharp. However, price is great for a ball bearing caster.
Despite the size of the caster (Ø100 - 200mm), R Series is rated as Light duty type - only 60 kgs per caster. Rubber tread is just light cushion but will help reduce noise and surface protection.