The ornamental design for a writinginstrument with rotatable handles, as shown and described.
FIG. 1 is a front perspective view of a writing instrument with rotatable handles, showing our new design, the broken lines representing environment and forming no part of the claimed design;
FIG. 2 is a front elevation view of the invention illustrated in FIG. 1, the broken lines representing environment and forming no part of the claimed design;
FIG. 3 is a rear elevation view of the invention illustrated in FIG. 1, the broken lines representing environment and forming no part of the claimed design;
FIG. 4 is a left elevation view of the invention illustrated in FIG. 1;
FIG. 5 is right elevation view of the invention illustrated in FIG. 1;
FIG. 6 is a top plan elevation view of the invention illustrated in FIG. 1;
FIG. 7 is a bottom plan view of the invention illustrated in FIG. 1; and,
FIG. 8 is a front elevation view of the invention illustrated in FIG. 1 showing our new writing instrument with the rotatable handles in a fully opened position, the broken lines representing environment and forming no part of the claimed design.