There is provided a variable pressure roller system for installing a preform having contact surfaces onto a configuration of a mold surface by applying pressure thereon. A beam pattern associated with at least one mobile terminal located within one of the cells is identified and assigned to a slot, providing at least one stream to said at least one mobile terminal. The compositions can be used either in vitro or in vivo to grow cells and tissues. A forming roll of the powered turks-head has a diameter equal to or larger than 70 times as much as a height-of a flange of the material.