Specification: 1) louver: 2.5" width(1cm thickness) 3.5" width(1cm thickness) 4.5" width(1cm thickness) 2) style: a. Standard type B. Arch and other designs 3) colors: refer to our colors swatch or customized colors are available(pls see the attached color swatches) 4) size: any available 5) top and bottom rail: 25mm thickness with various height 6) divider rail: optional when height less than 76", when over 76" high, divider rail required. 7) frame: now 3 designs available(pls see the attached picture)