The Scandinavian set comprises four felted KATSU stones of different sizes and colors. The smallest gray pebble in the photo is not felted - it's a real stone that was found in the Baltic skerries and became the prototype for this model. Moomin and his friends used small pebbles like this to build their stone pyramids. They sat down to rest and fish on the larger stones, and under the largest stone Snork found some golden sand.
The set is presented in two versions, Small and Large. The exact size and color of each of the stones are shown in the photo.