Pieces of magic coloring books8 different pictures children's great fun galt magic coloring books are filled with water in the pen that comes out of the package. when the pen is rubbed on black and white pages, colorful pictures emerge. after a while, the colored pictures disappear by themselves and the pages turn back to black and white. magic booksproduct dimensions19 x 15 cmproduct dimensions 21 x 17.5 cm. more than 100 stocks are offered to be sold at the campaign price. This publication is ideal for readers seeking insightful and educational content. Prepared by experienced authors and printed with high-quality materials. Great for students, educators, and curious minds.