A suspension of particles is rapidly self-assembled with a minimal number of defects into a three-dimensional array of particles onto a substrate under simultaneous sedimentating and annealing forces. The invention also relates to a process for building a tire in using this device. Alternatively, the airbag is fixed to a guide loop adjacent to the shoulder of the occupant and configured to allow for sliding of the seat belt relative thereto so that with the tongue latched in the buckle the airbag extends from the same position and across the occupant’s torso irrespective of the size of the occupant.