Fig. 4: Ultrafast soft robots that self-attach, transport cargo, and swim.

a A six-arm robot on a dandelion can self-grip when approaching magnetic tweezers without harming the fragile structure of the flower (Supplementary Movie 9). b The same robot can also grab, transport, and release nonmagnetic objects such as a polyurethane foam cube controlled by a permanent magnet (Supplementary Movie 10). c Manta ray-shaped robot with a cargo swimming in water (Supplementary Movie 11). d Triangle-shaped swimming robot twisting around its main axis and therefore moving forward in the water, both driven by a square wave magnetic field (Supplementary Movie 12). e Triangle-shaped walking robot rolling itself in air at high speeds when subjected to an alternating magnetic field (Supplementary Movie 13). Scale bars, 0.5 cm.