A pipe pig for travelling along the bore of a pipe, the pipe pig comprising a body formed of a deformable material comprising foam, and a plurality of electromagnetic sensors disposed about an outer surface of the body or within the body. The plurality of electromagnetic sensors include means for inducing an electric current in a wall of the pipe, and means for receiving an electromagnetic signal from the wall of the pipe, such that data about the pipe wall can be obtained as the pipe pig travels along a bore of the pipe.