Order Single Pieces of Owens Corning 705 Rigid Fiberglass Board (RFB) in 24" x 48" x 1" inch pieces here. Smaller quantities will save money and reduce unwanted waste.
The OC 705 is used in some bass trap and sound absorber designs. It is also a popular alternative to 703 rigid fiberglass board when a stronger and more durable surface is desired.
If you need 8 or more pieces, order Owens Corning 705 1 inch Case of 8 here.
View Owens Corning Product Information (PDF)
For more detailed information, see Selecting the Right Acoustic Material for a comparison of these materials.