- Unleash your creativity: Our colored curve pens allow you to effortlessly sketch beautiful curves in your notes or on various cute little books. Ideal for both marking and artistic creation, these pens enhance your study sessions and projects. For straight lines, simply use a ruler alongside the pens. - Innovative roller design: The roller tip enables the easy creation of fun and attractive marking lines. Please note that for optimal results, these pens must be held perpendicular to the paper to achieve complete and beautiful patterns. - Superior quality: Crafted from high-quality materials, these colored curve pens are durable and quick-drying. They deliver smooth, even ink flow with rich colors that are opaque on paper, preventing smudging. Each pen features a convenient clip for easy portability and storage. Product dimensions: 13.7 cm x 1 cm. - Versatile applications: Perfect for various tasks such as planning, note-taking, card-making, and DIY art projects. These pens are also a great way to bond with your children, providing an enjoyable activity that enhances parent-child relationships.