GICLEE PRINTS:
.......Use archival ink and look like the original, shipped without a frame.
.......On archival paper, are pencil signed by artist in the border. You then matt/frame to show this or not, your choice. 18x24 would go into 22X28 frame (standard size) under glass/plexiglass.
.......On canvas, are signed by artist on back and framed in 18X24 (standard size) with no glass. They are varnished with UV protection.