You don't need a description of each item. This is one of the difference between a CV and a resume. A CV is a list of things, more or less.
I might argue that since the OP is applying to grad school that specific skills they have from their previous positions might be useful for potential advisors to see, especially if there is software or analysis methods very specific to the field that profs would be glad to see that they don't need to train the new student to do.
I kind of think of these kind of CVs are less of a CV and more of a long resume. Although I guess one could put information about specific skills somewhere else in a grad application.
That being said, I don't know if anyone will read 4.5 pages of undergrad resume.