30 Zigzag blocks – 6 of each shape. Stack, build and create with this fantastic 30 piece open-ended set. This kit helps children by promoting imagination and logical reasoning skills. Children will work out the right way to stack and build their creations. The pieces are chunky which makes them easy to grip and each measures 20mm in width. The largest piece measures 170 x 24mm. All pieces are made from FSC certified beech.