These bic cristalreg ballpoint pens feature a durable tungsten carbide ball mechanism and smooth oil based ink for reliable everyday use the medium 10mm tip produces a thin 04mm line for elegant handwriting and detailed sketching the hexagonal barrel includes a red cap and end plug that matches the ink for easy identification this pack contains 50 red pens features ballpoint pen for everday use medium 10mm tip writes a 04mm line width transparent hexagonal barrel cap and end plug