The three lightweight wooden frames in this set are easy to manipulate as children explore threading the holes with lacing materials, such as wool, string and ribbon, to create colorful compositions. Such enjoyable activities are excellent for helping children to develop hand-eye coordination, dexterity and concentration. Made from sustainably sourced birch plywood. External diameter of frames: 8.25" , 5.5" and 2.75" . Age 18 months and up.