A rotor for an agitator bead mill, comprising - a multi-part metallic base frame, - a plurality of grinding tools which are arranged on the base frame, and - at least one non-metallic shell element, wherein the at least one shell element is configured such that the surfaces of the base frame are substantially covered or encased by the shell element, wherein a section of the rotor forms a cylindrical drive section, wherein the metallic base frame forms in the region of the drive section a grinding disk frame section, which is formed by one or more metallic grinding disks which are arranged at a distance from one another, wherein each of the grinding disks has two side surfaces, a through hole formed in the center of the disk for receiving an agitator shaft for driving the rotor and an outer circumferential surface, wherein a plurality of the grinding tools are arranged on the outer circumferential surface, wherein the part of the shell element for covering the grinding disks is formed by two half shells made of plastic, respectively, which surround at least the side surfaces and the outer circumferential surface of the grinding disk. - a multi-part metallic base frame, - a plurality of grinding tools which are arranged on the base frame, and - at least one non-metallic shell element, wherein the at least one shell element is configured such that the surfaces of the base frame are substantially covered or encased by the shell element, wherein a section of the rotor forms a cylindrical drive section, wherein the metallic base frame forms in the region of the drive section a grinding disk frame section, which is formed by one or more metallic grinding disks which are arranged at a distance from one another, wherein each of the grinding disks has two side surfaces, a through hole formed in the center of the disk for receiving an agitator shaft for driving the rotor and an outer circumferential surface, wherein a plurality of the grinding tools are arranged on the outer circumferential surface, wherein the part of the shell element for covering the grinding disks is formed by two half shells made of plastic, respectively, which surround at least the side surfaces and the outer circumferential surface of the grinding disk. wherein the at least one shell element is configured such that the surfaces of the base frame are substantially covered or encased by the shell element, wherein a section of the rotor forms a cylindrical drive section, wherein the metallic base frame forms in the region of the drive section a grinding disk frame section, which is formed by one or more metallic grinding disks which are arranged at a distance from one another, wherein each of the grinding disks has two side surfaces, a through hole formed in the center of the disk for receiving an agitator shaft for driving the rotor and an outer circumferential surface, wherein a plurality of the grinding tools are arranged on the outer circumferential surface, wherein the part of the shell element for covering the grinding disks is formed by two half shells made of plastic, respectively, which surround at least the side surfaces and the outer circumferential surface of the grinding disk.