Mounted on 4 ply pH neutral, acid free conservation board. Save time and money, these boards are ideal for studio use and eliminates the time and cost of mounting the board yourself. These boards offer a very professionally mounted paper, your framer will love you. Pastel Premier is a truly unique 100% Cotton Archival Quality pastel paper. It is double primed and coated with an aluminum oxide created for Pastel Premier to produce an ideal surface for pastel painting. The final seal coat makes this paper extremely durable and able to withstand almost any measure of scrubbing and reworking. The paper works with a wide range of media as an underpainting and accepts as many as 25 layers of pastel.100% Cotton/Archival QualityHeavy 145 lb., 310 gram paperAccepts multiple layers of pastelExtraordinarily durable surfaceMade in the U.S.A