Complete 2 speaker foam surround installation kitSome of the models that use this foam include : Electro Voice PI100, Tapco 100S, EVI12, 812-2054, Interface D, Sentry 500, Sentry IV A, The Entertainer (100), 100S (Entertainer), ETR 18, EVS 16A, EV 16B, EV16, EVS16, CH2560, DL12, DL12BFH and others that match the measurements shownSame American-made surrounds that we use in our professional repair facility; NOT cheap Chinese copies!! Kit includes: - 2 Premium American-made Foam Surrounds (Enough for 2 speakers)- Step-by-step installation instructions - (Also see video below)- 1 Bottle of premium professional-grade adhesive (Solvent-based)- 1 Adhesive application brush Kit 2A12B-EV Outer Diameter 11.75" - 298mm Outer Roll Diameter 10.625" - 270mm Cone Diameter 9.25" - 235mm Inner Diameter 8.5" - 216mm Roll Width 3/4" - 19mm Inner Attachment Angled How To Center Your Voice Coil Using Smartphone or Tablet