From RitFit:

We started our business with a goal to create a brand that brings better service and products to anyone who seeks to improve their physical strength and maintain a healthier life. With our unparalleled customer centered service, you will never have any issues maintaining or gaining information concerning your RitFit Neoprene Dumbbells:-)

Specifications:
★Product Dimensions: 4 x 4x 10.2 inches
★Diameter of the Handle:1.7 inches
★Item Weight: 40LB(20LB X 2)
★Material:Cast Iron

Main Functions
★Burn calories by raising heart rate.
★Increase muscle mass&improve cardiovascular health.
★Perfect for recovering training.
★Increase bone density, decrease risk of fracture;improve muscular endurance.
★Multiple Uses, great for deadlift, lunge with shoulder press, hip thrust with chest press&sumo squats.

How to choose your appropriate dumbbell size:
★Lighter dumbbells are nice additions to add resistance to squats, lunges, aerobic workouts and many more.
★Heavy dumbbells are perfect for building massive muscle in arms and shoulders, stability and core strength.