Rock Blocks were designed with asymmetrical shapes so you can build + balance towers, arches, mountains, letters, and shapes. Rock Blocks are not only a fun challenge for kids, but also adults! -Improves Coordination: Encourages development of dexterity, logic, and reasoning skills -Open-Ended Play: Balancing blocks allows children to build freely and creatively, letting the wonder of imagination run wild. -Unplugged Toy: Kids need hands-on, sensory toys, and rock blocks are sure to satisfy. No screens/batteries needed. -Captivating + Challenging: The best toy to keep kids, and the whole family, entertained and happy! -Child safe, non-toxic, and eco-friendly building blocks. -Handmade in Utah Sets packaged in a cardboard box. We use non-toxic, zero-VOC acrylic paints with an eggshell finish. Every block is unique. The blocks shown will be different than the blocks you receive. Sizing can vary between a width/height of 1.5" and 3". Vibrancy of color depend on wood type. The natural sets consists of 2 different woods: Alder + Pine. These species are two of the most sustainable and accessible woods the US has to offer. Each set will hold this 2 tone mix. Painted sets are made from Alder. This species is one of the most sustainable andaccessible woods the US has to offer. This wood has a moderate weight and hardness. All 5 sets consist average sized blocks.All 8 sets consist of mostly average sized blocks, with occasionally 1small block.All 16 sets consists of average sized blocks with 1-3 smaller blocks.