Brochures come in many sizes and shapes. There are sizes that fit in a #10 business envelope, commonly referred to as tri-fold brochures. They are a single sheet of paper, printed on both sides. Some brochures have four pages and fold in the middle. They look like a booklet. I have designed a large variety of brochures over the years. For products, for services, for businesses. Whatever information you want to explain, a brochure could be the perfect medium.