You'll be feeling the burn when you introduce the complete Cortex 2kg to 10kg Medicine Ball Set into your workout. Adding a medicine ball into your routine is a great way to burn more calories and develop functional strength. A thick rubber casing makes our medicine balls exceptionally durable, allowing them to retain their shape over time. The rubber also creates a strong surface to grip during intense workouts. With 5 medicine balls to select from, ranging from 2-10kg, there's a challenge to suit every workout.