A roller made lighter through the use of lightening elements. The absorbent main body has longitudinal side edges and transverse end edges. The plurality of arithmetic modules each may be configured to be enabled or disabled in response to control signals received from the first memory circuit. The disclosed peptides may represent structural prototypes for a broader class of peptides that is capable of assembly into supramolecular structures. The engagement devices can fixedly hold the sectors between the flange and the counter-flange.