Use Neatsfoot or some other type of OIL instead.
These are not worth much.  They will help your shoes a little but don't seem to last long.  If you can find something better, go for it.  Any type of sponge thingy won't last long it seems.  I'm not sure what kind of oil this uses, but the oil is fine.  The sponge just doesn't last long enough for the price.
Rating: 2 stars