SETS OF 10, 15, 20 AND 25LBS KETTLEBELLS: Available in sets of 4 for your own preferences: 10, 15, 20 and 25lbs kettlebell weights. HIGH-QUALITY CAST IRON WITH VINYL COATED FINISH: Each kettlebell is encased with color-coded vinyl to prevent corrosion, increase durability, reduce noise, protect flooring and enhance appearance.