>>1687161The surface is a flexible bio-mimetic nano-material over a metallic skull. It uses shear-thickening technology to help protect the central-processing unit in the head. If it is struck or shot, it solidifies to absorb the impact. It is also capable of limited self-healing. It can be set to cohere into a solid piece. For specific situations, it can be parted into individual strands. If it has been recently exposed to water, then the robot generally can't do a thing with it.