The flamingo pens cases are soft Silicone,Ink is 0.5mm Needle Tube Pen Lead, Moderate Thickness, Smooth Writing,NO Ink Leakage. Perfect Gifts: For Relatives,Friends and Colleagues, as Home Decoration, Stage Props, Party Decoration, etc. Interesting office stationery: Creative flamingos are placed in the office to add interest to work. Adding romance to your life:the flamingo pen is light and convenient, easy to carry, and can be kept in your bag anytime and anywhere.