Hollowcore wall panels are made via slip-forming (or sometimes extrusion). Hollowcore derives its name from the empty internal cores that run the entire panel length and thereby reduce the weight of the panels. Prestressed reinforcing is placed around the cores. Generally the panels are used as walling for industrial and commercial buildings in a non-loadbearing (cladding) capacity. Cladding panels are designed for wind actions and sometimes may retain earth fill against the building. The generic surface finishes are machine trowel, water washed exposed aggregate and profiled ribs. Painting and staining can also be applied. The actual finishes available will depend on the individual manufacturer.