In sea food industry arount the world, Javid Tejarat Attar sells different sizes of fresh and frozen hsrimps with high knowledge of training sea food and it is capable to provide sea food for many big different shopping malls. If you need to know about the size of 30-40 what does it exactly mean to you? different countries have many different meaurments for classifying the size and number. Some countries measure the number of shrimps in Pound and some countries meaure in kilogram. There are two different numbers in both measurments, a big number and a small one.