The diameter of the ocean ball is 6.5cm, scientific size for baby to hold and prevent wrong consumption,single option contains 200balls,box safe packaging, clean and hygienic. CE certification,PE environmental protection material, soft and not easy to break, healthy and harmless, can bite, good elasticity, no depression, soft and skin-friendly. Combined with the law of harmonious hue in nature,uniform brightness, ,gentle colors does not hurt eyesight, and exercises baby's color perception, very good decoration and photo props. Smooth sanding,does not fade,oil-repellent layer on the surface, effectively isolate stains, easy to clean with water,thickening fine workmanship, one-piece molding. We highly recommend that you take these ocean balls homethen you and your child have their own private space,let baby grow happily and parents work easily.