We make our 14 x 14 ft trampoline frame from hi-strength music wire steel. Each MaxAir frame employs a wiggle wire design for spring friction reduction, helping to lessen spring wear. We treat the frames with a special powder coating process that provides additional protection from rust and wear. Our frames come in multiple pieces for ease of handling and installation. All the design elements of our frames contribute to their longevity and make installation as straightforward as possible.