Lift your Ninja skills to the next level with our professional-grade Gym Chalk Ball and Bag. Gym chalk protects hands, so you can keep at what you love to do longer—NinjaLine obstacles, climbing, gymnastics, and more. Toss the gym chalk ball from hand to hand to improve grip, then store the ball in the durable bag with adjustable belt and cinch closure. Replacement Gym Chalk Balls are available. For ages 5 and up; adult supervision required.