Good: Ader Kettlebells: Cast in a in solid piece with any seams ground down before finishing for a smooth comfortable bell that can be used for high repetition workouts without issue.

Best: Ader Pro Grade Kettlebells: Every weight is the same size. Perfectly smooth bare steel handles. Color coded by weight, just like competition bumpers.

Best: Rogue "Kilo" Bells:  U.S.A. Made with a perfect matte black finish. Some of the best kettlebells in the world.