Cast Iron Kettlebells can be a tremendous tool for building strength, burning fat and increasing endurance. Kettlebells strengthen and sculpt the shoulders, back, legs, biceps and more. Made of high-quality solid cast iron, these kettlebells come in graduated weights, allowing clients and members to increase their strength one step at a time. Cast Iron Kettlebell Features strengthens shoulders, legs, biceps, back and more. Made of high-quality solid cast iron. Ideal for commercial use.