Just acceptable quality: steel bracket is thin with just (again) average bearing & wheel quality. However the price is cheap and you can still be happy if using the caster for light duty as the ball bearing will offer easy manuevering.
Superior than most of small China caster, nearly archive the same level with Japan ones. Sturdy rubber that is hard to break, hard to wear out by daily use. This is one of the most success product line of Phong Thanh.