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OHTO Minimo Ballpoint Pen, Extremely Slim Compact All-Metal Body, Oil-Based Black Ink, Retractable Needle Tip 0.5mm, Blue Barrel, NBP-505MN-BL,

Amazon.com: OHTO GS02 Roller Gel Pen, Retractable Needle Tip 0.5mm Fine Point, Khaki Barrel, Ultra-Quick Drying Black Gel Ink Pen, All-Metal Hybrid ,

Amazon.com: OHTO GS02 Roller Gel Pen, Retractable Needle Tip 0.5mm Fine Point, Khaki Barrel, Ultra-Quick Drying Black Gel Ink Pen, All-Metal Hybrid ,

Violet Micro Potentiometer Knob - 4 pack : ID 5537 : Adafruit Industries, Unique & fun DIY electronics and kits,