There are three types of bubbles available and they are all gifs at 50x50 pixels. The animated bubbles have a white background.
White Background
00001 - 00010
00011 - 00020
00021 - 00030
00031 - 00040
00041 - 00050
Black Background
00001 - 00010
00011 - 00020
00021 - 00030
00031 - 00040
Animated
00001 - 00010
00011 - 00020
00021 - 00030