3pcs Stress Relief Switch Clickable Neutral Pen Set, 0.5mm Double Ball Bullet Tip Quick Dry Black Ink, Stress Relief Switch Pen, Fun Clickable Switch Design, Press And Play During Writing, Relieve Study Stress, Fun And Practical, 0.5mm Double Ball Bullet Tip Tungsten Steel Nib, Smooth Ink Flow, Continuous Ink Supply, Stable Writing Without Stuttering, Round And Full Lines, Suitable For Solving Problems, Taking Notes, Daily Homework