Challenger II Racing Foam Ear Bud Speakers with 1/8in Mono Plug Professional Series are equipped with Knowles Hearing Aid speakers to provide clear race radio communications. These speakers utilize a hearing aid transducer instead of a standard speaker for unmatched clarity. With a rugged blue cabling and a 1/8in mono plug, these earbuds are made in the USA and have a cable length of 18 inches. Replacement foam earbud is available for sale individually. Note that due to health laws, this item is not returnable.