This is a strap, keyholder, or charm.
SHAAAARK! Now you can have a very small Great White Shark dangling from your phone! This mighty open-mouthed dweller of the seas and movie star is about 6cm long, and has a lobster-claw clasp attached to its back, so you can attach it to the included loop or the peg, whichever means of attaching it to your cellphone will work. By the way, you can also attach the loop to it and twirl it around and yell "SHARKNADO!" to amuse your friends and family.