The highlighter is made of plastic smoothed casing surface for comfort holds, writing smooth, non-toxic and safe to use, which works well on all paper surfaces, including glossy and thin papers, magazines, study notes and other markers; The text that has been marked with a watercolor highlighter are still clearly legible as it's not marked after scanning or coping.It palm sized and light weighted, which can be easily fitted into school bag¡¯s pocket or children pencil case. 3.58" L x 3.58" W x 0.59" H