Alcohol Based Ink : Our markers are alcohol-based, strong penetration and dry quickly. They have bright colors and are not prone to pilling after repeated application. They can be used to write on non-permeable paper, quick drying, waterproof and environmentally friendly Dual Brush & Chisel Tips : The dual tip alcohol marker has a chisel tip of 1-6mm and a Brush tip of 1-6mm. The tip material is robust and durable, allowing users to create unique and expressive paintings Special Design : Color-coded caps & portable storage box. Our dual tip alcohol markers with unique color-coded caps make it easy for color identification and organization. Besides, the carrying case allows for convenient creativity on the go. All the special designs help you to easily identify and quickly pick up the coloring markers you need, offering a neat, speedy and hassle-free storage experience App Features : The App has a variety of features that allows you to match colors by taking pictures or using images from your cellphone. Through intelligent algorithms, the app recommends the color codes of the most suitable alcohol markers for painting and provides various graffiti material images. It provides a variety of mainstream color schemes for easy professional color selection. The e-color card feature enables you to find the colors you need anytime, anywhere