FIG. 1 is a perspective view of a hair curler showing my new design;
FIG. 2 is the second perspective view thereof;
FIG. 3 is the third perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a perspective view of the hair curler, showing in a closed state; and,
FIG. 11 is a partial enlarged view of FIG. 1.
The broken lines illustrate portions of the hair curler, which form no part of the claimed design.