a packer device , with a commercial name called “ frac disc ” includes an interior packer mandrel and radially surrounding cone , slip and seal system that seals and engages the surrounding casing or other tubular member . the cones expand the slip system and the slips compress and expand the seal system , simultaneously . the slip system provides a means for supporting the seal system when pressure is applied from above or below the packer . the close proximity of the seal and slip system in combination with a separating packer body provides for a very short packer , or a “ minimum material packer ”, that offers lower cost , higher performance , and if required , faster mill - out .