The invention concerns a product inhibiting transduction of G heterotrimeric protein signals combined with another anti-cancer agent, in particular farnesyltransferase inhibitors, taxol or gemcitabin, for simultaneous, separate or prolonged therapeutic use in cancer treatment. An assignment is provided of base addresses to the devices. A capacitor is electrically connected across the distal terminals and connectable in parallel with a series-connected energy source and switch. In a plan view of each end surface, each abutment section lies on a portion of an imaginary five-pointed star which includes five outer vertices alternating with five inner vertices. The attachment allows each roller to pivot independently of movement of other rollers.