Very suitable for adult coloring books, petroglyphs, glass, DIY photo albums, black cardstock, drawing boards, scrapbooks, pottery, wedding crafts, dark paper, greetings Cards, calligraphy, etc. are more suitable for painting, and can be used in classrooms or bookcases for adults. Higher quality, water-based ink, acid-free, quick-drying, super smooth application, ergonomic design, light weight, easy to hold and extremely durable.The price on the web page is 12 colors. We also have 8 colors and 20 colors.