Clif Shot Bloks Energy Chews 18 Pack. Easy to handle, easy to digest, and delicious on your palate, Clif Shot Bloks energy chews are the perfect source of nutrition for endurance athletes on the go. Each Blok is a semi solid, 33 calorie cube, making it easy to customize and track caloric and electrolyte intake during long outings and races. Available in a variety of flavors plus options with caffeine and additional sodium these mighty morsels will become a staple source of your exercise nutrition. Each pack contains 6 Bloks with 3 Bloks constituting a single, 100 calorie serving.