Biothane available in 29 different colors and 5 different widths.  Whatever combination you would like!!  Whatever length you would like!!! 
Collars and leashes can be single or double color.  Collars can also include a brass name plate with up to 3 lines of text.
All hardware is solid natural brass.  I like the strength and durability of brass, but just let me know if you would like something different.