I need coils

Im looking to get some new coils for my machine and im not quite sure what to get .10 wrap 12,etc.one is a liner and one is a shader .The liner is a Paolini and the shader is a Time machine. Eny help in telling me the differance in the types besides the actual times it wraps around the coil would be very helpful.

I Just wanted everyone to know I have Apprenticed at a shop but seems I need to go back for some more seeing how I do not no some things like what is the defferance in coils.and I am currently looking to further my education at a shop even thoug I was a manager at a shop .I just feel that I would like to learn more from another artist.as I belive everyone can teach you something new it maybe what not to do or what to do but learning is learning.but if enyone could give theair opinions on coils I would be very interested in what people have to say.particularly Joe,Taz and Julio but all others I would still love to hear from all opinions thanks so much for your time reading this.