8" INCH SPEAKER MOUNTING SPACER RINGS FOR FIBERGLASS MDF RING-8R (10 RINGS) Thickness: 3/4"; Width: 3/4"; Inner Diameter: 7 1/8"; Outer Diameter: 8.5" This product will fit in most speakers on the market. 1 pair MDF 8'' Inch Speaker Rings Great for fiberglass, kick pods, and baffles. PLEASE NOTE THAT DUE TO THE PRESSED WOOD MATERIAL USED FOR THESE RINGS, THEY ARE VERY EASILY CUSTOMIZABLE FOR SPECIFIC SIZES. THESE RINGS CAN BE SHAVED OR FILED FOR AN IN-BETWEEN SIZE OR FOR A MORE CUSTOM FIT.