This is the 13RR mechanical pencil refill pack. The Red edition.
Fits No. 13 and No. 15 Mech. Pencils

Keep your Rite in the Rain Mechanical Pencil going strong with a handy lead refill pack.

LAST LONGER
12 Extra-long (4.72″) leads for uninterrupted writing, no matter the conditions.

EASY LOAD
Mechanical Pencils are easy to reload, simply drop a single piece into the shaft under the eraser.

DARK THICK LEAD
The thick 1.3mm lead boldly marks your Rite in the Rain Paper just as easily as it marks lumber.