Modelled on the naturally smooth shape of river stones, these unusual building blocks will engage preschoolers both visually and mentally. Theyre perfect for balance and stacking games, embellishing playscapes, or building small rock forts. This four-piece set is painted in gorgeous graduated blue and grey hues and looks beautiful stacked up on a shelf when not in use. The pieces are hand-crafted in Europe using lime wood and finished with completely non-toxic water-based paints and plant-based oils. Grimm's Spiel and Holz Design has been manufacturing high quality, imaginative wooden toys since 1978. Inspired by the philosophy of Waldorf education, Grimm's Spiel and Holz Design has been manufacturing high quality, imaginative wooden toys since 1978.