(Burlingham Sports) Add the "Stacker Stand" under "The Stacker", and this incredibly clever jump system can now reach heights anywhere up to 3'6" utilizing the standard 3" increments. The "Stacker Stand" can be purchased separately which allows you to add an additional 18" to your jump height. Because the "Stacker Stand" is well balanced, it will stay in place, as you maximize your jump height to 5'0" with an extra set of Stacker Stands (extra pair sold seperately). Includes one pair of Stackers and one pair of Stacker Stands. Will hold 4" PVC pipe (not included). Purchase PVC pipes locally.