Red King Crab Claws L4

Кlimbs of a red king crab in a package of 1 kg. The meat has a fibrous structure, a delicate sweet taste. It is advisable to use the entire set at once, the limbs can not be frozen again, otherwise they will lose their delicate taste. We recommend ordering one whole claw for each guest at your table.
What does the letter L and the numbers 2,3,4,5 mean in the name of the crab?

Producer: Russian Federation, Far East
Packaging: 1 kg, plastic bag
Storage conditions: 180 days at temperature of -18. Do not re-freeze

Nutritional value/100 g:
Protein 22 g
Fat 2 g
Carbohydrates 1 g
Energy 80 kcal