This is a Chevrolet dealer set of color sales brochures.  The boxed set includes all brochures for the 1990 Chevy cars and trucks.  It also includes a letter to the dealership from Chevrolet.  I am guessing that only one set was sent to each dealership.  The 5 brochures are shown in the listing photos.  The cardboard case measures about 12”x12”x3”.  Condition is good with minor soiling from storage.