The difference between UTP cable with STP cable

Differences UTP cable with STP cable.

Differences in STP cables with UTP cable is if the STP cable with a protective aluminum diselaputi, whereas UTP cable is not. whether the use of aluminum on the membranes that cover the STP cable? . The point is to avoid the radiation field around the magnet on the cable. but the price of kebel STP is more expensive than UTP cable. how the composition of the cord? . same as the existing arrangement on UTP cable.