Bows of Upa Pandavas

The five jewels of bows born by the five sons of Draupadi were

1. the Raudra, 
2. the Agneya, 
3. the Kauverya, 
4. the Yamya, and
5. the Girisas.

Source
http://www.sacred-texts.com/hin/m07/m07023.htm