Owens Corning 703 Rigid Fiberglass Board (RFB) Single Pieces have a dimension of 24" x 48" x 2" inches.
RFB is one of the most popular materials for acoustic absorption. It is typically covered with fabric and mounted on the walls in a studio, control room, or listening room. Although AFB of similar density is equally effective at absorbing sound, the Rigid Fiberglass Board is somewhat cleaner to work with and holds itís shape well.
If you need 6 pieces or more, save money by ordering Owens Corning 703 2 inch Cases of 6 here
View Owens Corning Product Information (PDF)
For more detailed information, see Selecting the Right Acoustic Material for a comparison of these materials.