Refill for the Ohto Horizon GS01 Pen (will not work for the older-style Horizon pens).
0.7 mm line width.
130/Z Staple Refill
$ 3.00
2mm Lead Refill
Ain Stein 0.5 HB Lead Refill
$ 4.50
Ballograf Original Ballpoint Refill - Black Fine
$ 4.00