The Kettlebell with a rubber base is a steel weight that looks like a cannonball with a handle.
They use it to perform ballistic exercises that combine cardiovascular, dynamic and flexibility training.
It is the main equipment of the sport of weightlifting.

Weight:  4kg, 6kg, 8kg, 10kg, 12kg, 16kg, 20kg, 24kg, 28kg & 32kg
Usually ships in: 1 to 3 days