【Heavy Duty Material for Your Safety】: Ninja warrior obstacles course for kids is using strong polyster webbing material. With a 250 lbs capacity, the Ninja obstacles kit are still rated for most adults. Our exclusive ratchet has reinforced steel and the handle has a comfort TPR rubberized grip. Sewn pockets are completely reinforced for extra durability.ip. Sewn pockets are completely reinforced for extra durability.