Similarly , the first piezoelectric material of outer mantle layer 2104 and the second piezoelectric material of inner mantle layer 2106 may be selected .
The diameter of golf ball 2100 remains substantially similar to golf ball 2000 when in the presence of an applied electric current .
Similarly , the first piezoelectric material of outer mantle layer 2104 and the second piezoelectric material of inner mantle layer 2106 may be selected so that the diameter of golf ball 2100 remains substantially similar to golf ball 2000 when in the presence of an applied electric current .