These are Kind of Saree made by Tussar Silk in Bhagalpur,bihar.Its a non-mulbery Silk.[1][2]
Tussar saree are made in various colors viz , Dhaniya (light green), Mas (deep blue), Kariya (black), Anchi (deep purple), Jamalla (purple), Darra (deep rose red), Katha (maroon), Took Lal (bright red), Narangi (orange), Piura (yellow), Rani (deep Indian pink), Malti (mauve pink), Phiroza (turquoise), etc.