Each tube is one of a kind, with unique patina colors and textures. 
Large raw brass tubes to create your own jewel set (bracelet, necklace etc.,)  
Metal - brass
Size - 40x8mm (1.5"x0.3")
I made the photo on my workbench on my mobile phone and the pictures have not been enhanced. So, you can see the real colors of the patina!
The colors of the patina are natural, and all processes have no harsh chemicals used.  
The brass/copper tubes are covered by a thin layer of lacquer to save the patina's natural color. 
You can add additional layers of lacquer to protect the finish further.