The pieces are made of high quality plastic and ultimate care has been taken to make all the edges smooth and rounded. You will not find any sharp edges. Encourage Creativity can be a combined action that is important for social play. Children receive creative stimulation by making their own designs with blocks. Blocks are a benefit for the children because they encourage interaction and imagination. Many More combinations Unleash Your childs imagination using this building blocks and there are options galore and whole lot a child could do.