Hiya
New to this site! But hope I can help.
You can get individual lashes in pots and jars or you can get strips of lashes called minks.
The individual pots and jars come in Cs Js Ds and Bs
The mink strips come in Cs Js Ds Bs Y lash and W lash and also in Rapid Js and Cs.
Most individuals range from 8mm to 15mm in length (so everything in between)
Thickness wise most individuals come in thickness of 0.15, 0.20, 0.25 and 0.30. 0.30 are very thick and not very popular.
For mink strips the thickness is 0.15, 0.20 and 0.25 again length from 8mm - 15mm.
Did you need a reference to a site to buy from as I would recommend the company I use.
Hope that helped! And anyone else please feel free to add more info!
Eyelash Princess