With the Cortex Standard Kettlebell Set, you'll experience an intense strength and cardio workout with a range of weights for progression and a variety of workouts. Our standard kettle bells use an EnduraCast design, with a heavy duty plastic casing to withstand intense workouts. A full set of kettlebells with 5 weights from 6-16kg gives you a huge range to find the right challenge for every exercise Get a comprehensive full body workout with the Cortex Standard Kettlebell Set.