outsunny 33ft ninja slackline set 30 piece 10m rope with obstacles climbing frame outdoor climbing training playset equipment for children aged 3 6 gymnastics rings ropesDo your kids want to become real ninjas? Outsunny has developed a custom Ninja training course for children aged 3 to 6. They can choose from a variety of obstacles and accessories, including a 10 m Ninja slackline, gym rings, a gymnastics bar, and more for endless climbing fun. This climbing set can be set up anywhere with two robust tree trunks, supports, or similar anchors.