1:100 scale, or one-eighth inch scale, styrene plastic HO Ribbed Roof/Corrugated.
Two 7" x 12" sheets of 0.020" styrene in white.
Vacuum formed to approximate 1:100 scale architectural elements. This is approximate to the most common hobby railroad "HO scale." HO scale varies from 1:87 to 1:100, and visually the difference is negligible. You will find an abundance of HO scale miniatures that will work with models build from these sheets. True 1/8 inch to the foot scale would be 1:96; visually indistinguishable from 1:100.
Styrene is highly versatile. It's more flexible than it's cousin ABS plastic. It can be drilled, sawed, sheared, punched, threaded, machined, vacuum-formed or heat-formed. Non-toxic. Cut intricate designs and patterns using these precision curved shears. Not limited to model building, styrene sheets are great for signs, prototypes, displays, replacement parts and more. Bond pieces together using solvent adhesive. Adhere pieces to things like foam core board, cardboard, or wood using spray glue or white glue. You can also glue it with CA glues. Interesting fact: polystyrene is approved by the F.D.A. for food contact.