Each float is 8 inches in diameter. Cup Hole Diameter: 2.8 to 3.1" Floating Drink Holder Fits Almost Any Size Cup; Beverages and Bottles.SIMPLE AND PRACTICAL: This drink float is so lightweight that you can take it to any party, just fill it with air if you want to use it. When you and your friends get thirsty while floating or swimming, you can grab a float drink in the water and enjoy your party time.The cute drink holder design makes them a really cool pool party decoration that looks great when floating with full size inflatable pool floats.They're ideal pool accessories when you're playing in the sun; because you can always have a cold drink nearbyFloats are great for summer entertaining; nice to have when all you want to do is relax and hang out.The Best Reusable Souvenirs - Do you think it's useless after your first birthday? I do not think soIt can be used for your second child or as a gift to the children of your relatives and close friends to express your best wishes. You can also hang it in your kid's bedroom, and if you're a photographer, you can use it as a prop to take pictures, but anyway, it'll be a trivial but meaningful hand flag that will last a lifetime on your kid's first birthday