The stones are delivered in a plastic bag. Like the original stones from Denmark, they are made of sturdy plastic, have a good grip and stick together perfectly. The special highlight here is of course the glow. After charging under a light bulb, they last for about 30 minutes. That's enough from my point of view, too. Children don't play in the dark forever. Other evaluations have criticised the fact that complete houses cannot be built from 100 stones. That's correct, but I also understand these bricks more as a "design element", with which e.g. normal Lego buildings get a new pep. Conclusion: High price, but stones of good quality, which allow new creative building.