These raw crevettes are defrosted in a controlled enviroment to give an excellent shelf life. The 20/30 size crevettes are Vanname prawns from France.The 16/20 & U10s are the hugely impressive, in size and in taste, black tiger prawns from South Africa. All prawns come with a five day shelf life and we ask that you give us at least five days notice on the 10/15 & U/10 sizes.