How long is the roll and how wide is the paper?

The roll is 17 feet long, so the castle scene runs continuously. The packaging lists dimensions of 4.72" x 1.97" x 16.54", which describe the boxed roll rather than the unrolled sheet.

Does it stick to walls without damage?

It has a self-adhesive backing, so it presses onto smooth surfaces like walls, tables and floors. Press lightly at first and lift slowly if you need to move it.

What can kids color it with?

Crayons, colored pencils and most markers work on the paper. Markers can bleed through, so put a sheet or mat underneath on surfaces you want to protect.

No. It is a paper roll meant to be colored once and then displayed or recycled. The adhesive is for holding it in place, not for repeated peeling and resticking.

How many children can use it at once?

The 17-foot length lets several children color side by side, especially when it is stuck along a wall or a long table. Younger kids may need help peeling the backing.