... dumbbellKettlebells are cast iron balls with a handle. KF-DB-88 Round Handle DumbbellMaterial:Cast IronWeight:As client's ... increases the demand placed on core stabilization, agility and proprioception*Use for squats, throws, cleans, jerks, snatches, rotational ... increases the demand placed on core stabilization, agility and proprioception*Use for squats, throws, cleans, jerks, snatches, rotational ...