The Cuban Shrimp is a slow sinking Crustacean imitation.  This version from Fulling Mill has some light UV dubbing and crystal flash tied in with rubber legs, to give the fly a great life like action. 

The Cuban Shrimp is geared towards your Permit and Bonefish flats action. But would equally be at home in the estuaries, chasing Bream, Bass and Flatties.