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Unique 6 balance bar plus 6 W-shaped legs provide double stability. In addition to the 6 w-shaped legs to evenly support the frame of the trampoline, our upgraded 15 ft. trampoline is also specially designed with 6 balance bars to connect every legs, which provide a more even force to make trampoline more stable and prevent trampoline poles from bending or even breaking. Double stability, double security. Size: large.