Replacement strings for Shamisen Box

This is a set of replacement strings for Shamisen Box.
There are one each string.
Please select the type of string for Shamisen Box which you use.

Shamisen Box (Thick neck): 21-1(silk), 15-2(tetron), 13-3(nylon)
Shamisen Box (Thin neck, mini): 16-1(silk), 15-2(tetron), 13-3(nylon)
E SHABO: 16-1(silk), 15-2(tetron), 13-3(nylon)