Rock Blocks are unique eco friendly blocks designed after rock cairns. Because of their asymmetrical shape, you can build and balance towers, arches, mountains, letters, and shapes! They are geared towards kids ages 2-10, however are fun for kids and adults. -Handcrafted. -Naturally Dyed. -Eco-Friendly. -Non-Toxic. -Handmade in America Set of 5. Each set comes in a cloth drawstring bag. Natural Rock Blocks are handcrafted from various wood types. No harmful chemicals used and non-toxic. Every block is unique. The blocks shown will be different than the blocks you receive. Sizing can vary between a width/height of 2" and 3". Vibrancy of color depends on wood type.