This kit contains three Lee Neutral Density Filters, .3 (one stop), .6 (2 stops), and .9 (3stops).
Neutral Density filters offer the possibility to achieve otherwise unachievable results. ND filters appear gray and reduce the amount of light reaching the film. They have no effect on color balance. They enable the shooter to adjust exposure without affecting color balance. ND filters appear gray and reduce the amount of light reaching the film.
Determining which neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters. Speaking generally, the 2-stop value (ND 0.6) effectively compensates average situations.
 
https://www.bhphotovideo.com/c/product/102426-REG/LEE_Filters_NDSET_Neutral_Density_Polyester_Filter.html/overview