Coors Light is Coors Brewing Company's largest-selling brand and the third best-selling beer in the United States. Introduced in 1978, the brand has been a favorite for nearly 30 years. The simple, silver-toned can caught people's attention and the brew became nicknamed the "Silver Bullet". Coors Light is available nationwide in cans, bottles and kegs. This premium light beer has 102 calories per 12-ounce serving and 4.2 percent alcohol by volume.