The bic cristalreg fun ballpoint pen features a durable tungsten carbide ball mechanism and oil based ink for smooth controlled writing the vibrant purple ink and larger 16mm tip gives a thicker 06mm line ideal for stylish titling designing and larger handwriting the lightweight barrel has a smoky translucent finish and is hexagonal for comfort in use this pack contains 20 purple pens great for colour coordinating your work ballpoint pen with fun purple ink durable tungsten carbide