What is the difference between a nano and a micro?

[Bronsononson]

micro coils generally are just large enough to feed cotton through. Nano coil diameter is usually too narrow to allow to feed the cottom directly through and are place onto cotton directly.

 

[danny4x4]

In my opinion, the granddaddy (Super_x)of micorcoils has just answered your question. He's the man who brought micro coils to the masses.