This listing is for basic wall only housing.
Size - you are choosing the inner dimensions of the housing.
Choose your thickness:
Thin - 1 layer of acrylic (1/4" x1)
Thick - 2 layers of acrylic (1/4" x2)
Extra Thick - 3 layers of acrylic (1/4" x3)
Questions? Check out our Housing FAQs page.