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In this letter, we propose and characterize a new type of tetherless mobile microgripper for micrograsping that is made of a magnetic elastic composite material. Its magnetically-programmable material and structures make it the first three-dimensional (3D) mobile microgripper that is directly actuated and controlled by magnetic forces and torques. With a symmetric four-limb structure, the microgripper is 3.5 mm long from tip to tip when it is open and 30 μm thick. It forms an approximate 700 μm cube when it is closed. The orientation and 3D shape of the microgripper are determined by the direction and strength of the applied magnetic field, respectively. As a mobile device, the microgripper can be moved through aqueous environments for precise grasping and transportation of micro-objects, pulled by magnetic gradients directly or rolled in rotating magnetic fields. The deformation of the microgripper under magnetic …