The new ZipWall® SLP™ (Spring Loaded Pole) Package contains 2 spring loaded poles, two grip disks and comes with the new tethered plate. Plastic sheeting is not included. The SLP plunger and spring are built into the pole. This makes the poles lighter (1.5 lbs. each) and stronger. With the plunger now made of solid polycarbonate, it is unbreakable when used even under the toughest conditions. Because this product is lighter and more compact it is even easier to handle, store and transport than the original ZipWall KT12. And, because the new design allows for more efficiency in manufacturing, we can offer them at a new lower price.