Carl’s Jr. launched two firsts this week: sliders and happy hour.

The chain and its sister concept, Hardee’s, began selling mini burgers, including one with a triple patty. Single, Double and Triple versions went on sale Jan. 31 for $1, $1.50, and $2, respectively. Each mini charbroiled burger is topped with American cheese, mustard, ketchup, pickle and diced onion.

Carl’s Jr. called the slider a “fun, portable and snackable package that puts all competitor snack options to shame.”

Carl’s Jr. and Hardee’s are also launching their first Happy Hour program featuring one item: the double charbroiled slider for $1. Happy Hour is from 2-5 p.m. daily.

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Taco Bell announces smaller, faster restaurants for mobile customers The sliders and the happy hour deal are available through April 24. The double slider can also be ordered as a meal for $5, which includes two double sliders, fries, a 20-ounce drink and a chocolate chip cookie.

Other fast food chains that offer a happy hour include Irvine-based Taco Bell and Sonic.