It's almost 5cm wide and 13cm long. Shrimp tongs are 8 cm long and 6 cm wide. Boston lobster, alias American crayfish, Boston lobster, etc., is an arthropod belonging to the genus Eriocheir, which lives in cold sea areas. Its meat is tender and smooth, and its products are rich in protein, low in fat, vitamins A, C and D, and trace elements such as calcium, sodium, potassium, magnesium, phosphorus, iron, sulfur and copper, and it tastes delicious.