Gradient-modulus star copolymers were prepared by crosslinking poly[isoprene(I)-b-I/styrene (S)-b-S] tapered block monoanions with divinylbenzene (DVB) in benzene. The dilute-solution properties of these stars were characterised by static and dynamic light scatterings (SLS and DLS). The ratio of radius of gyration over the Stokes radius (R-G/R-H) in benzene decreased gradually and approached unity as the arm number became large. Even gradient-modulus stars with multiarms behave not as neat hard spheres but as soft spheres which were penetrable near the edge in a good solvent. It was found from the results of DLS that gradient-modulus stars formed unimolecular micelles even in selective solvent.