Sorting stacking rocks, wooden 36 pcs 📍excellent used condition 📍ages 3-6+ 📍 MATERIAL: Stone balance building blocks are made of high quality wood and coated with eco-friendly paint. It is natural, safe, non-toxic and exquisitely crafted. Hand-polishing process ensures a smooth, burr-free surface for better child play. 📍NOVEL STACKING TOY: Unlike the traditional building blocks, every block is a polyhedron, each different in size, color and weight, making stacking game more challenging so that kids can complete the building process in a whole new way. 📍SKILL DEVELOPING: The stone blocks have many flat cut surfaces so the stones can be stacked and kids can stack different shapes of stones to the highest. Unlike regular building blocks, this wooden stone balancing and stacking game is a better way to stimulate a child's sense of challenge and develop their hands-on skills, promote creativity, resilience and persistence and to strengthen fine motor skills, visual-spatial skills, color recognition and thus training logical thinking.