1pc New Style Photochromic Thick Barrel Click Neutral Pen 0.5mm Bullet Tip, Color-Changing Under Sunlight, High Aesthetic Value Student Black Practice Pen, Bullet Tip Pen Head With Full Ink Flow, Smooth And Fluid Writing, Bold And Clear Handwriting, Resistant To Ink Splatter And Skipping, Comfortable For Long-Term Daily Practice, Creative Photochromic Pen Barrel, Brighter Color Under Stronger UV Rays, Different Appearance Indoors And Outdoors, Fun And Novel, Outstanding Aesthetic, Thick Barrel Design With Ample Grip Space