Magic Pen & Invisible Ink: Christmas "Santa's Workshop" & "Rock'n Around the Tree" Picture & Game Books (2 Pack) Double Your Fun With 2 Different Invisible Ink & Magic Pen: Christmas Books Set Includes "Santa's Workshop" & "Rock'n Around the Tree" 46 Pages of Fun (23 pages each) & 2 Invisible Ink Pens Printed with Pride in USA For Ages 3 and up