Grimm's Complementary Color StarGrimms Complementary Colour Star Wooden Puzzle This building set and creative puzzle in one encourages an intuitive feeling for colours and forms, spatial skills, logical thinking and develops fine motor skills. 18 pieces in a wooden frame. Materials: lime wood, non toxic water based colour stain non toxic plant based oil finish. Size: Overall diameter 25cm single blocks 4cm thickness. Age Group: older children and adults 6+, preschool 3 to 6