Yes4All Toning Ball, Medicine Balls for Exercise, Soft Medicine Ball for Pilates, Yoga and Fitness, Perfect for Balance, Flexibility, 2-10lbs

From the brand

Body Conditioning Toning Ball

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PVC SHELL – UNSTABLE IRON SAND INSIDE: Made of PVC and filled with iron sand, our toning balls are durable to function well for a lifetime. Iron sand inside creates instability to activate different muscle groups for a leaner & tighter body
DIAMOND KNURLING SURFACE: Designed with diamond knurled surface, Yes4All Toning Balls are easy to grip and hold for a variety of exercises, allowing you to practice in the comfort of your home. Working great on inner thighs, core muscles and back
COMPACT AND PORTABLE FOR TRAVEL: You can definitely bring the balls along when you travel to have a mini workout. Also, you can keep them at the office and take them out to stretch or warm up your muscles during break or after a long day at desk.
7 WEIGHT OPTIONS FOR VERSATILE UTILITY: being a version of med ball, our toning ball collection varies in size and weight from 2 to 10lbs, so you can choose the most suitable ones for your level and practicing purpose