This building block set is wonderful for small children because of its simple geometrical forms. This forms give room for the creativity, train the fine motor skills and the logical and spatial thinking. This set is also wonderful in combination with the Supplement Building Set 10201 with more forms and blocks. 30 buidling blocks in a wooden frame. Materials: lime wood, non-toxic water based color stain/non-toxic plant based oil finish. Size: frame length 44,5cm. single blocks 4cm thickness, length 4-24cm.