The brakes feel somewhat plastic/less sturdy, but are performing well. Really like them for indoor low bookshelf.

I'm a novice diy'er and bought these little wheels with brakes. The locking feature also differentiates from other wheels.

Box was torn open. Poor quality rubber. Did not support rated weight. The twelve i bought are defective all of them.

The locks are awful. The wheels don't even turn freely, they're jammed/seized in the frames! And the locks don't work at all, won't stay in the locked position, are impossible to adjust.