Acoustic tile
Asphalt
Brick-common
Cement mortar
Clay
Gypsum plaster&sand
Hardwoods-oak-maple
Hardboard-high density
Hardboard-siding
Particle board-low density
Particle board-high density
Plywood
Sheathing-regular density
Softwoods-fir-pine
Wood-cross balsa
Wood-cross cypress
Wood-cross fir
Wood-cross oak
Wood-cross yellow pine
Wood-cross white pine
Wood-radial oak
Wood-radial fir
Gypsum_Smooth
Sand
Rock-granite
Rock-limestone
Rock-marble
Rock-quartzite
Rock-sandstone