This product is spot on! Great value, great quality and lots of fun. The plastic case seems to be quite durable and the pens click into place easily. The colours are brilliant and when you first open the case it definitely gives you the wow-factor seeing all the colours neatly laid out. We'd already had a few of these twistables but when I saw this neat collection I just couldn't resist it. Unlike ordinary crayons, which can easily break into smaller pieces, these twistable crayons last for a very long time, especially if you carefully put them back in the carry-case after each use. It makes a great present too, perfect for boys or girls, looks more expensive than it really is and the case is easy to wrap up. The manufacturer's recommended age is 4+ but we've had these pens since my son was 2.5 and they seem perfectly safe to me, safer than ordinary crayons, in fact.