Sashiko thread 40m col.2 5x1

the description says "40m col.1" on another product it says "col.2" what does col.1 or col.2 mean?

This includes 5 or 1 skein?

Is this the exact same thread as amazon listing for "yokota sashiko thread fine 170m col.2 unbleached" but just a different length? thanks!