Fitvids Kettlebell Sets 4 Piece Strength Training KettleBells Weight Set 5lb, 10lb, 15lb, 20lb Kettle Bell. Set of 4 Kettlebells: Includes 5lb, 10lb, 15lb and 20lb kettlebell. Wide flat Base: The kettlebells feature a flat bottom for stability during in use or on the floor, will not not roll or wobble.