If they used this on a newer charger, the heat shrink might not shrink all the way, because it will have to be too big to fit over. You may want to create a note or warning at the beginning that for cables with larger adapters, like USB, the old ipod 30-pin connector, or the new magsafe mac chargers.

You may want to note that the heat shrink should be big enough to slide over the end of the charger. This might be harder with the newer Mac chargers, cause the adapter is bigger.