Select Case code not returning correct statement

This is my code which I use in conjunction with a drop-down list. The "ni" range is the output range for the drop-down box. The "n" in the case statements is the value I want associated with the "ni", and the "nval" is the output where the value for "n" goes. When I try to run this code, The value for "n" that is returned is 0. I am not very good at vba and therefore cannot find where my problem is. This is the code.

Sub Roughness()
Dim n As Integer

Select Case Range("ni")
    Case 1
        n = 0.011
    Case 2
        n = 0.012
    Case 3
        n = 0.015
    Case 4
        n = 0.022
    Case 5
        n = 0.011
    Case 6
        n = 0.03
    Case 7
        n = 0.035
    Case 8
        n = 0.04
    Case 9
        n = 0.009
    Case 10
        n = 0.01
    Case 11
        n = 0.012
    Case 12
        n = 0.011
    Case 13
        n = 0.019
End Select

Range("nval").Value = n

End Sub

I have another Select Case sub in my program that works perfectly, and has the same format as this one.

Then the value of Range("ni") is none of the values you have listed.

But when I step through the sub, it will stop at the appropriate case, go to end select, but when I check the range "nval" it has 0 in it. I have also changed "ni" to other arbritary cells, and directy input values into the cells, with the same results.

Does it execute one of the "n=x" statements?