We recently bough the den making pegs and the children absolutely loves them. They are so easy to use so even the 2 years old are able to make their own dens. The children put blankets over the chairs and fasten them with the pegs and then they sit inside in the dark looking at books with a torch.
We have tried to make dens using normal pegs, but they always fall off, but these ones clip around the edge of the chairs in a really good way and they don'f fall off easily. The den making pegs has helped us to provide hours and hours of fun. A really good investment. I highly recommend the pegs.