This set of six wooden building block gems can be stacked together in a variety of ways to construct unique towers and landscapes. Children will delight in seeing how the different shapes stack together; they will also begin to understanding the fundamentals of critical thinking and balance. Utilizing this block set will strengthen children's fine motor skills, hand-eye coordination, and concentration through play! Cleverly made from 'Plan Wood', the material is composed from excess wood shavings and less than 1% of formaldehyde-free E-zero glue. The process requires no harsh chemicals, making these builders beautiful, clean and sustainable!