With this index I can find a dozen phone numbers before a computer can even boot. Invented 70 years ago and never equaled - just slide the button to the letter you want, pop, there's the phone number. Holds addresses, too. Plastic body, felt feet, emergency numbers on top. 18 pages, 40 entries per page. Silver. 3 1/2" long x 6 1/2" high x 3/4" deep.