Comes with 2 packs Increases calcium content of crickets so they can be fed to insect-eating reptiles and amphibians Added vitamins and vegetables optimizes crickets health, and in turn, the health of the reptiles that eat them Easy to use, just place inside your cage with crickets and that's it Calcium base with food inside to increase the nutritional value of crickets Made in the USA! The Zoo Med Cricket Block Reptile Supplement offers an easy way to deliver calcium to insect-eating reptiles and amphibians. It?s a no-mess alternative to calcium dusting that boosts the nutrient content of live crickets?aka gut loading. This calcium-based block has added nutrients and vegetables to optimize cricket health and the reptiles that eat them. It?s easy to use?just place it inside the cage with the crickets and let them feed.