These are archival pigment prints, sometimes referred to as Giclee. They are made using the highest quality pigment inks available printed on museum quality papers.
Truly of museum quality, when properly framed and displayed, you can expect these prints to remain free from fading and maintain original print quality for longer than a lifetime.
I primarily use two types of papers. Smaller prints (under 20") are made on Canson Infinity Baryta Photographique - this paper has a soft gloss finish. Larger prints are made on Hahnemuhle 100% cotton rag - a heavy weight paper with a finely textured matte finish.