Meet the PILOT Frixion Ball 2 – a seriously cool pen that lets you write, then erase, and write again! It uses a special thermo-sensitive ink that becomes transparent when friction (like rubbing with the eraser on the back of the pen) creates heat. So you can clean up mistakes easily. This one is the \Non Color\ multicolor version with an ultra-fine 0.38mm tip (that's about 0.01 inches), perfect for detailed writing in notebooks or on documents. It's a slim, 2-color slide lever type pen – super convenient to click back and forth. The total length is about 5.7 inches. Important note: the ink can also fade with temperature changes (like leaving it in a hot car), and it's NOT for official documents or addressing envelopes where permanence is needed. But for notes, lists, planners, or sketching? It's awesome. The refill model is LFBTRF30UF if you need replacements. Try it, it's like magic!