[PREMIUM QUALITY] - Strong PP material used to make these ninja monkey wheel obstacles ensures years of outdoor fun for kids. With a 300 lbs load capacity, it's safe for children ages 3-12. [UNIQUE DESIGN] - The swivel carabiner attaches to the ninja release line, helping kids have fun with obstacle ninja courses with different experiences using swivel wheels. [AUTHORITY CERTIFICATION] - CPC has certified all Rainbow Craft ninja warrior obstacle courses, including ninja slacklines and ninja props, to meet standards required for children's play. All plastic materials, polyester, and metal parts are included within the children's scope of use. Whether it's indoor ninja equipment or outdoor backyard play, kids will enjoy ninja warrior fun safely. [OTHER BENEFITS] - The large 10-inch diameter swivel wheel with a 16-inch nylon chain is also suitable for adults to play in the air, offering indoor and outdoor training. [EASY TO USE] - Fully assembled swivel bars only need to have the carabiners attached to the ninja line or swing, all of which takes less than 10 seconds, it's that easy! Perfect for indoor gyms and outdoor jungle gyms!