1. Safe and Convenient: The acid and nontoxic ink of the Color Curve Marker prevents smudging, fading, or leaking. Featuring a variety of welldesigned curve line types, its unique lace design effectively highlights important sections and creates beautiful patterns, making it both practical and essential for study and daily use. 2. Durable: Each linear colored pencil boasts a soft yet durable 0.4mm tip. Made from materials, our pen glides smoother than others, allowing you to effortlessly create elegant marking lines with just a single touch—simple and fun. 3. DoubleTip Design: The dualtip marking design is for drawing the roll end of lines. The Curve Highlighter Set combines highlighters to mark in various colors, serving as an tool for both study and artistic projects. 4. QuickDrying Smooth: The Color Curve Pen for kids features fastdrying ink that ensures quick drying, clear, and smooth writing. Simply place the pen under the text you wish to highlight and move the pen with ease.