When most people hear the term "bookshelf speakers" they usually don't think of monsters like these 40 year old Bozaks. No shelf looks right without insulators, so I have also filled that obligation as well, a mix of PIFONA (Porcelain Insulators From Outside of North America), and of course, some glass both of foreign and domestic origin . The riverboat drawings were dome by my Uncle Frank, arout 50 years ago.