Janod Magic Felt Tip Pens - Set of 10

What you're getting

These pens do something a bit clever: each one's got two colours in it. You get 8 regular coloured pens and 2 that change colour when you swipe them over your drawings, so if your kid's decided the flower should be purple instead of pink, they can just fix it on the spot.

It's the sort of thing that keeps them entertained for ages while they're getting to grips with holding a pen properly. And honestly, the novelty of watching colours shift keeps even the indecisive ones happy.