Why so cheap and what does S&B mean. On the better trawlers grading and presentation of product is key to getting the best prices for the landed catch, so after cooking, any prawns that are broken or have a soft shell are removed from the final product. The taste and texture are as good as the rest but they do have a broken or soft shell. Those in the know have been getting a massive bargain in these for years. Packed in a top loader carton so you can grab a little or a lot.