[Vric]

Styrene are sheet of plastic. The main brand is Evergreen and cost about 2$ for 2 sheets

They come in different tickness
.10, .15, .20, .30 .40 and more
there is even some with draw on it that can be used to make inter cooler on other thing.

.10 is used to fill gap between 2 pieces, can be usefull
.20 and .30 are good for modeling parts and starting to custom built aero part
.40 is about GTwing size

you use plastic glue (the same you use for model) to glue it.

Very usefull stuff for the price