These earphones are part of the Degen DE 1103 radio. But i could get several more from the company.
These are the best earphones i have heard. A little bassy comparing to my protype Koss UR20 but nevertheless have the broader audio comparing to other earphones, making me feeling as a Senhheiser earphone.

The company's price is USD 4 . I have bought pieces two years ago and for the moment two of them have been sent to junk . The one has been suddenly gone out of order on one of its buds . As for the second , one of the buds has been filled with water from one of my ears ...

In the atatched file (PDF), youwill find speftral responses of several radios thati own including DE 108 1102 1103 from Degen ,PL200 and 550 from Tecsun , one old AIWA walkman and one analog radio Bolong

You may reply either here or send me an email at greekdx (at) otenet (dot) gr
Enjoy the text..