A prosthetic nucleus prepared from blends of polyvinylalcohol and polyvinyl pyrollidone or its copolymers for replacement of the nucleus pulposus in intervertebral discs is provided. The band provides a covered space on each side of the pillow, where the user may rest a hand for greater comfort. The mechanism deploys a network virtual image to the build environment to form a network virtual machine. A single camera preferably acquires both the iris and face images by changing at least one of the zoom, position, or dynamic range of the camera. A chain runs through a through hole on the gripper of the second cover so that user can hold the chain to lift the plate and the interior boxes out of the main box.