Pentel is a pioneer of graphite lead research. Pentel Ain Stein is the most recent refill lead innovation, these brilliant leads have a ceramic frame that holds the lead together firmly from the inside, making it on average 10% stronger than Pentel original refill leads.

Ain Strein is Pentels most recent refill lead innovation
Brilliant new leads have a ceramic frame
Holds the lead together firmly from the inside
On average 10% stronger than Pentels original refill leads
The swivel top tube makes dispensing quick and easy