Sturdy & Safe: These10 lightweight yet sturdy cardboard nesting and stacking boxes are eco-friendly and non-toxic, ensuring safety. It complies with CPSA and ASTM F963 Development: Stacking blocks can develop your little one's fine motor skills and hand-eye coordination, featuring fun jungle and farm animal designs for endless enjoyment Exploration: Nesting blocks encourage exploration of visual discrimination and spatial reasoning abilities, as well as cognition of size & weight. while the nesting design allows for easy storage Education: With these sorting cubes, your child can learn letters, numbers, counting, shapes, and the correlation between numbers and quantities, foster early education and cognitive development Ideal Present: Perfect for toddler over 18 months. These versatile blocks offer endless play possibilities, such as stacking it up to build a tower and knocking it down, lining it up to make a garden train, playing interactive hide-and-seek games with parents, and building creative modeling