The keychain is made of PU foam which is floating. It can keep your keys floating when it is dropped in the water. The size of it is 3.14 inches x 1.4 inches x 0.7 inches. It is a good organizer for your keys. What a great idea for beachgoers, boaters, swimmers and more. Makes a great gift for boat rentals, hotels and other beach-friendly activities. Available in four great colors. Add your company logo or message to customize.