The invention relates to a rotor (10) of a dual centrifuge which can be rotated about a drive axis (A) in a centrifuge, which rotor comprises at least two rotary units (26) that are arranged symmetrically to one another and have a bearing (32) and a rotary head (30) which is connected to the bearing (32) and which is mounted in the bearing (32) so as to be rotatable about a rotational axis (R1, R2), which rotary head (30) can be driven about the rotational axis (R1, R2) relative to the rotor by another rotary mechanism (46) of the centrifuge and has a rotary head receiving unit (80) for at least one sample container or at least one sample container receptacle (100, 110), with the rotational axis (R1, R2) of the rotary head (30) being inclined relative to the drive axis (A) of the rotor, the rotary head receiving unit (80) being designed to receive an elongated sample container receptacle (100, 110) or an elongated sample container, and the longitudinal axis of the sample container receptacle (100, 110) introduced into the rotary head receiving unit (80) or the longitudinal axis of the sample container introduced into the rotary head receiving unit (80) extending perpendicular to the axis of rotation (R1, R2) of the rotary head (30) or being oriented at an angle ranging between more than 0° and less than 90° relative to the axis of rotation. According to the invention, at least one connection region (52) is provided to which at least one damping mass (54) can be selectively attached either in a releasable manner or, by means of a fixing element, in a permanent manner for operation.