Check the listing for details. ONE VINTAGE KELVIN CAPACITOR EP-21 .01% FROM ENGINEER'S RADIO ESTATE. Condition: Used. Listed at 0.99 USD. Just got in a bag of these. from Engineer's estate who liked to tinker with radios..... Double check me on these, they are Marked : KELVIN EP-21 100K .01% They have different sub numbers like 7709-B and 7704-A. not sure if new old stock, good pulls, etc, but he saved them. maybe from work? do not know. Capacitor? they are priced at $1.50 each if you wish to try a few. If you know more please let me know, I did web search with no luck. wonder what originally they were made for? assume a capacitor. maybe industrial? use zoom , as found . you know as much as me now. most likely more. many thanks ! you are buying one, I pictured a hand full. quantity is per one. Please see all pictures and use zoom feature. Often the pictures describe the item better than words.! Also please see the 10,000+ vintage radio related parts and other great antiques and oddities I listed. Radio's are Fun ! Just like radio parts ? Click on Electronics in my store to see just the electronics I listed ! I always combine shipping to my best, just order and wait to get the invoice from me. On Global Shipping I cannot combine as that is in Ebay's hands. Please note : Ebay is starting to collect sales tax as required by law for certain states. Thank you for you order and please follow my store.! New items added daily. Also you can go into my store and pick the category for easy shopping. Best to you and Many Thanks, Mike