I claim the ornamental design for a set of wrist bands, as shown and described.
FIG. 1 is a front view of an upper surface pattern for a first wrist band of the set showing my design;
FIG. 2 is a front view of a lower surface pattern for a second wrist band of the set showing my design;
FIG. 3 is a perspective view of the upper surface pattern from FIG. 1 on an exemplary wrist band of the set showing my design;
FIG. 4 is a perspective view of the lower surface pattern from FIG. 2 on a second exemplary wrist band of the set showing my design; and,
FIG. 5 is a perspective view of the upper and lower wristbands shown as a set.
The broken line showing of wrist bands is for the purpose of illustrating the environment of the claimed surface pattern and forms no part of the claimed design.