The iiGen Magic Pen with Refill, themed Gabby's Dollhouse, reference IG5655, is a pen with ink that changes color or appears only when crossed over with a special marker. Gabby's Dollhouse is an animated series about Gabby and her magical cat friends, who live in a dollhouse full of rooms and surprises, one of the most popular phenomena among young children in recent years. The included refill allows you to continue using the pen after the original ink runs out, without having to buy a new pen from scratch. It's a great option for children who like surprise effects in their writing, instead of a conventional pen.