You will receive ONE unsexed Mexican Dwarf Crayfish. (please do not request male, female or pairs... I am new to these crayfish myself and do not know how to distinguish their sex) These dwarf crayfish are bright orange in color and add real interest to your aquarium. Scavengers by nature and tolerant of most water conditions. These crayfish mature at roughly 2 inches total, large enough to be safe from most small fish and still small enough not to become a predator. Currently shipping Juveniles just over 1 inch in size. They grow and mature very fast. Shipped USPS with an arrive alive guarantee. In the event of DOA, please contact me within 2 hours of delivery with clear photos.