Today's casters are tubeless type and the inner tubeless has been exhausted, the caster brakes cease to function, we changed this time.
Although the outer ring is slightly firm and has a sense of roughness, the bearings are very smooth and can be recommended. Please check the size carefully.
I am using an L type cart for loading work tools and moving from the coin parking to the work site, but exchange with wear on wheels. Until now, without ball bearing, the shaft was quite smooth with LS bell hammer lubrication, but if it comes with ball bearing, the smoothness when loaded is different.