What It Says On The Box:
Slightly larger, meatier and slower moving than Brown Crickets these are the most popular choice of staple diet for carnivorous species. They will with stand the high humidity required by some species better than the brown crickets and resist drowning in water dishes. It is recommended that you unpack crickets to a larger container and offer additional food and chunks of carrot for moisture.
As a general rule tarantulas will readily eat food items which are half their own body length or less. A typical-sized, adult tarantula will be content with four large crickets per week. They don't need to be fed very frequently; you can give them all the crickets at once and that will be fine for the rest of the week.