Lifeline(R) Kettlebells are manufactured with first run/virgin iron ore, not scrap, and are formed into a strong, balanced, single-piece casting with a flat wobble-free base. A clean, consistent surface and durable powder-coat finish gives Lifeline Kettlebells premium level quality. DESIGN: Made with virgin iron ore, not scrap, and formed into a strong, balanced, single-piece casting with a flat wobble-free base, consistent surface and durable powder-coat finish Void free surface: We use a proprietary casting process which creates a smooth, comfortable handle and premium appearance The Lifeline kettlebell is cast in one solid piece, this results in a stronger, more durable handle. Precision casting creates kettlebells with no seams, burrs, welded handles or rough spots Wide Flat Machined Base: The base of our kettlebells is machined so it is flat. This eliminates wobble when on the floor