A reflection can be generated by the back reflection sheet composed of a transparent sheet, a transparent sheet having a partly or entirely by a plurality of composite surfaces consisting of the front, each of the composite surface are inclined only in one direction by the cylindrical surface and in the opposite direction inclined surface or plane composed of the composite face either continuous or in which is inserted between the plane and the structure of the cylindrical surface area accounted for most of the complex plane, and the transparent sheet also has a plurality of contiguous right angles prisms back. Brand: Toray, Teijin, or domestic reflective film. Thickness: diverse. Reflectivity: 95% have questions welcome to negotiate!