Approved by ASTM F963 -17 and the CPSIA. 100% non-toxic and safe. The crinkle pages with funny rustling sounds. Animal tails have different textures and fabrics for little hands to explore. Tails books measure 8.9 inches tall and 4.7 inches wide. You can hang it on the stroller, crib or car seat cause it equipped with a fabric Velcro loop.