Zebra SL-F1 ST Ballpoint Pen

The Zebra SL-F1 ST is a mini ballpoint pen with an extending (telescopic) design. This pen is very similar to the more common SL-F1, but the ST model is larger and, most notably, thicker than the standard SL-F1. The SL-F1 uses a standard D1 refill while the SL-F1 ST uses Zebra's proprietary ballpoint refill, which
The Zebra SL-F1 is a mini ballpoint pen with an extending (telescopic) design. 

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