Shifting Wheels ACCESSORYThe Shifting Wheels make it easy for one adult to shift the trampoline when yard work needs to be done. The wheels slip easily under the legs to make moving your Springfree Trampoline a quick and easy task. Springfree Trampoline accessories come with a one year manufacturer's warranty (except 3 months for the ball). Boxes Box dimensions Number of box 1 Box Weight(lbs) 1 6. 6 Box Dimension(. in) 1 15. 75 x 10. 5 x 3. 5 Box Contents Contents 2 shifting