Nothing’s better than a dumbbell - Improve cardiovascular health - Increase muscle mass - Burn calories by raising heart rate - Increase bone density, decrease risk of fracture - Improve muscular endurance 22LBS Package include 4x 1 kg (2.2lbs ) dumbbell piece 4x 1.25 kg (2.75lbs ) dumbbell piece 2x 13.8 inch dumbbell handle 1x15.7inch Extension rod 4x screw nut33LBS Package include 4x 1.5 kg (3.3lbs ) dumbbell piece 4x 2 kg (4.4lbs ) dumbbell piece 2x 13.8 inch dumbbell handle 1x15.7inch Extension rod 4x screw nuts. 44LBS Package include 4x 1.25kg (2.75lbs ) barbell piece 4x 1.5 kg (3.3lbs ) barbell piece 4x 2 kg (4.4lbs ) barbell piece 2x 16.5 inch dumbbell handle 1x15.7inch Extension rod 4x screw nuts. 66LBS Package include 4x 1.25kg (2.75lbs ) barbell piece 4x 1.5 kg (3.3lbs ) barbell piece 4x 2 kg (4.4lbs ) barbell piece 4x 2.5 kg (5.5lbs ) barbell piece 2x 18.1 inch dumbbell handle 1x15.7inch Extension rod, 4x screw nuts. 88 LBS Package include 4x 1.25kg (2.75lbs ) barbell piece 4x 2.5 kg (5.5lbs ) barbell piece 8x 3 kg (6.6lbs ) barbell piece 2x 18.9 inch dumbbell handle 1x15.7inch Extension rod, 4x screw nuts. NOTE : 88lbs dumbbell set packaged in 2 packages Features: Adjustable weight for diverse muscle training; Foam covered connecting rod to reduce neck's compression and relieve fatigue; Non-slip design with rubber coated handle for firm grip; Quick conversion between dumbbell and barbell, with the connecting rod;