The CAP Strength 40 lb Adjustable Cast Iron Dumbbell Set is an effective workout choice for both beginners and advanced fitness enthusiasts. This CAP Strength 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 Strength 40 lb Dumbbell Set also features spin lock collars to secure the weights in place and is made of 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. The ideal choice for both beginners and the advanced fitness enthusiasts Fully adjustable with (4) 5 lb plates, (4) 2.5 lb plates, 2 threaded solid dumbbell handles, and 4 spin-lock collars Plates are made of solid cast iron with a baked enamel finish Different weight plates allow you to create several weight combinations with the dumbbells Weights can be gradually added as the workouts intensify Ideal for home use