Check the listing for details. New 3/4" Brown Knob Felt Washers Set of Four - Old Antique Vintage Tube Radio. Condition: New. Listed at 4.50 USD. Click here to add us to your favorites and Click here to view our other auctions including restored antique radios, Zenith black dial wall clocks, neon lighted RCA Nipper Dog clock, grill cloth, decals and supplies.Here we offer a set of four brown knob felt washers to protect your radio's finish around the knobs. The outside diameter of the felt is 3/4" and will fit most table top, cathedral and tombstone models. Inside diameter is 1/4". We do offer a 1 1/8" diameter felt for larger knobs as well. Just check out our eBay store or other items for sale. Price is $4.50 per set of four which includes free shipping within the United States. Fine print just because that one special someone will try: The radio in the picture is to show how the knob felt looks on the shaft. The radio is not included with the sale.