PVC Rams Crown Header, 8" tall and projects 2" which are shipped in the separate section so that returns can be made to suit window or door openings on site. Its made up of 3 separate trims; 1x8 PVC Trimboard; 2" Rams Crown; and Bead Trim. Having the parts shipped separately is idea for long run where you want to stager the joints.  

To keep shipping cost down, for 8 foot lengths, we measure from tip to tip or the long end of the cornice.