TIESOME 0.7mm Ballpoint Pen Refills 5pcs Black

What these refills replace

These TIESOME 0.7 mm ballpoint refills come in a pack of five black cartridges, each 9.9 cm long and 0.4 cm wide, with a matching spring included. They fit most retractable pens that accept a standard metal refill of this length. Ideal for office workers, students and anyone who prefers a fine line without changing pens.

Installing and common issues

Drop the refill into the barrel, add the supplied spring if the original is missing, and reassemble; the metal body slides in without tools. The only frequent problem is a slight length mismatch — some pens need a refill a few millimetres shorter or longer, so check the old cartridge before ordering.

The spec that decides fit

The critical measurement is the 9.9 cm overall length combined with the 0.7 mm tip size; if your pen takes a different length or a broader point, these cartridges will not work.