These are classic "remote key shells (also called keyless entry transmitters or transponder keys) with an integrated metal blade.
They combine:
A plastic head that houses the electronics (battery + radio transmitter for locking/unlocking doors, and usually a transponder chip for immobilizer authentication).
A cut metal key blade that still turns the ignition/door locks mechanically.
The image shows two nearly identical black shells (likely aftermarket or OEM replacements) with a single large button recess and a keyring hole at the bottom.
Common modelsToyotaCorolla, Camry, RAV4, Yaris, Echo, Matrix, Highlander