Concave Finds Convex Set by Grimm'sTricky building game in which the matching two parts are to be found. As a tactile variation, put the pieces in a bag and find the matching parts through the sense of touch. The individual parts have interesting and unusual shapes so they are also ideal for outdoor play and imaginative building. Details: Width: 20. 5 Length: 26. 5 Height: 2 4 parts, L = 6 12 cm, H = 2. 5 cm, lime wood, non toxic water based color stain Age recommendation: 4+ Not for