Sonic Drive-In is an American drive-in fast-food restaurant chain based in Oklahoma City, Oklahoma. They have over 3,500 restaurants in 43 U.S. states, serving approximately 3 million customers per day. They are known for their use of carhops on roller skates. Menu consists of classic fast food items, such as hamburgers and french fries as well as other "carnival-like" fare such as onion rings, corndogs, and hotdogs. Other items include Breakfast Toaster sandwiches, slushes, sundaes, and banana splits.