UNIT BRICKS Mini Unit Bricks 72 piece STEM sets 2 PackMini Unit Bricks are made from Plan Wood, which is the worlds most sustainable wooden material. Designed using the entire tree root ball to create a perfectly weighted and balanced building experience. These building blocks are an hierloom quality limited edition educational toy. Give the gift of building with tactile wooden bricks. Each block has hand carved lines to create a lovely brick pattern for fraction recognition. Promotes fine motor skills,