P.M.B stands for Pissen Mit Blut,a German industrial project that seems to be active from mid 90s until 2003.
This cassette was released by the German label Art Konkret run by Markus Kropfreiter of Drape Excrement and other projects.
This one in my hands is a limited edition of 100 hand numbered copies released in a metal-fence on a white tape with xeroxed strip reading "P.M.B. - ENTBEINT" glued to side A.
Numbered edition was printed in marker on side A of tape. It came with one small xeroxed insert of image & artist's contact info-(all the scans provided here).
A very good tape for people into ritual noise industrial music.