Seattle-based Starbucks is rolling out a new drink size called Trenta—the chain’s biggest drink size yet, Reuters reported.

At  31 ounces, the Trenta is just seven ounces larger than its Venti cups, which currently are the largest size on the Starbucks menu. The Trenta size is debuting in 14 states, including Virginia, Georgia, Florida, Texas, Hawaii and Arizona, on Jan. 18 and is expected to roll out in California on Feb. 1. It is expected to available at all of Starbucks U.S. coffee shops by May 3.

The Trenta is expected to be exclusively for iced coffee, iced tea and iced lemonade.  Drinks in the Trenta size will cost 50 cents more than similar Venti-sized iced drinks, the company said.

The new size was tested in several U.S. markets last year, in response to customer demand for larger cold beverages. Starbucks reported that unsweetened drinks in the new size will have fewer than 90 calories and that sweetened versions will have less than 230 calories.

McDonald’s Corp, has been vying for Starbucks’ customers with frappes, fruit smoothies and espresso drinks such as lattes and cappuccino. It also has gained business by selling 32-ounce sweet tea drinks for $1 each. Twitter has been abuzz with convenience store chains reminding customers they can top Starbuck’s 31-ounce Trenta. For years, c-stores have drawn customers with fountain drinks in large sizes, including 32 ounces and 64 ounces.