Pentel Hybrid Gel Grip pens feature a metal tip and a rubber grip for hours of writing. The pigment ink in the Hybrid Gel Roller is made from water and a binder and contains wax pigments. These wax pigments prevent the ink bleeding into the paper. They also provide a smooth ink flow without blobbing or skipping. The colours are light-resistant, waterproof and acid-free. The 0.8mm tip gives a 0.4mm line width. This wallet Set includes 12 assorted colours: Black, Red, Blue, Green, Milky Orange, Milky Yellow, Milky Green, Milky Pink, Milky Blue, Milky Violet, Gold & Silver.