PM Preventa 05051 PM Preventa Wedge Base Counter Pen, Black Barrel, Black Ink, Med Pt, 0.80 mm, 1 Unit Refillable, antimicrobial ballpoint counter pen with a smooth grip features a wedge base, Built-in AgION technology prevents the growth of bacteria, yeasts, molds and fungi. Base attaches firmly to counter with adhesive or screw (both included). Heavy-duty aluminum pen with a brushed aluminum base. Nontoxic design.