US Patent No: 10,060,143 B2CC4-90 - CC4 with 2nd 90 ReturnMODULAR - Lineal Ft. / BoxMODULAR RAKED - LF/Boxn/aCLOSURE - Lineal Ft. / Boxn/aUTILITY - Lineal Ft. / Boxn/aNORMAN - Lineal Ft. / Box250