My friends collection of Chines snuff Bottles

This is part of my friends collection fo Chinese Snuff Bottles. 3 of them are 2+1/2ins tall (including the lids), the forth one is slightly smaller. He has many others that are very modern, but he thinks these ones are antique. I don't know as this is not "my area", but I like them enough to share the pics with you all. Neither of us knows anything about them so if anyone out there can give us an idea of age, area of China, anything really we would appreciate it.

Thanks for taking the time to look at my pictures

Jannie