The CAP Barbell 40 lb. Adjustable Cast Iron Dumbbell Set is an effective workout choice for both beginners and advanced fitness enthusiasts. This CAP Barbell 40 lb Dumbbell Set comes with several weight plates that allow you to create several weight combinations with the dumbbells. Weights can be gradually added to this Barbell Dumbbell set as the workouts intensify. This CAP Barbell 40 lb Dumbbell Set also has spin lock collars to secure the weights in place. This CAP Barbell 40 lb. Adjustable Cast Iron Dumbbell Set features solid cast iron construction with a baked enamel finish that lasts for years. This adjustable dumbbell set is great for home use, as it does not require a lot of space for use or storage.