Single KEF Donut Foam Dust Cap With AdhesiveKEF Donut Foam Dust Cap With Adhesive Some of the models that use this foam include : 103 4, 104 2, 105 3, 107 2 Inside Diameter . 84" Outside Diameter 2. 75" Kit includes 1 Kef Donut & 1 bottle of professional grade speaker repair adhesive. Our adhesive is superior to that provided by other sellers. Same components that professional reconers use; NOT cheap Chinese imitations!!