Single piece foam surround(Enough for 1 speaker) Some of the models that use this foam include :Optimus 2539, 2540, 2554, 2589, 40-1101, 40-1102, 40-1331B, 40-2029, 40-2042, 40-2047, 40-2043, 40-4033, 40-4037, 40-4047, 40-1014, Nova 18, Nova 7B, Nova B, Optimus 300, Optimus 30, Optimus 45, Optimus 75, Optimus 650, Optimus 660, Optimus T-120, T120, Optimus STS-500, S0153, T-30, T30, T-110, T110, T-200, T200, T-300, T300, Radio Shack and others that match the measurements below Same surrounds that professional reconers use; THE BEST QUALITY foam available!This is the foam only. Complete repair kits are available in our DIY Foam Surround Repair Kits category. Foam Dimensions------ Surround A10-Opt Outer Diameter 9.75" - 248mm Outer Roll Diameter 8.875" - 225mm Cone Diameter 7.75" - 197mm Inner Diameter 7" - 178mm Roll Width 5/8" - 16mm Inner Attachment Angled