FIG. 1 is a first perspective view of the spa shell of the invention;
FIG. 2 is a second perspective view of the spa shell illustrated in FIG. 1;
FIG. 3 is a top plan view of the spa shell illustrated in FIG. 1;
FIG. 4 is a first side view of the invention illustrated in FIG. 1;
FIG. 5 is a second side view of the spa shell illustrated in FIG. 1; and,
FIG. 6 is a third side view of the spa shell illustrated in FIG. 1.
The broken lines are for illustrative purposes only and form no part of the claimed design.