Abstract: A block and pad unit for use in forming a seabed mat includes a concrete block having an upper surface, a lower surface and at least four sides extending between the upper and lower surfaces. An opening extends from the upper surface to the lower surface of the block. An abrasive resistant pad is attached to one of the upper surface or the lower surface. The pad includes a base having a lower side adjacent the block and an upper side facing away from the block, an opening aligned with the opening of the block, and a plurality of dome-shaped mounds extending integrally upward from the upper side of the base and distributed about a periphery of the opening of the pad.