The MA1 Black Cast Iron Kettlebells range starts at a light weight of 4kg and reaches massive weights of up to 40kg. Set at steady increments of 4kg, as you progress, you can slowly work your way up the weights and bell sizes. the cast iron kettlebells increase in bell size and handle thickness with its weight allowing more focus on grip strength than the Pro Grade Kettlebells. Classic black in design, these Kettlebells are easy on your hands while providing great grip as you thrust and push your way through your kettlebell sessions. Great for commercial use such as gyms and personal trainers, they will also fit right into a home gym. Available in 4kg to 12kg in 2 kg increments and then up to 40 in 4kg increments.