The ornamental design for a earbud for earphones, as shown and described.
FIG. 1 is a perspective view of an earbud for earphones, showing the new design;
FIG. 2 is a front view of FIG. 1 thereof.
FIG. 3 is a back view of FIG. 1 thereof.
FIG. 4 is the left side view of FIG. 1 thereof.
FIG. 5 is the right side view of FIG. 1 thereof.
FIG. 6 is a top view of FIG. 1 thereof; and,
FIG. 7 is a bottom view of FIG. 1 thereof.
The broken line showing of the cord in FIGS. 1-5 and 7 depicts environment and forms no part of the claimed design. All other broken lines depict portions of the earbud for earphones that form no part of the claimed design.