What bit and bridle is made of

Harness for controlling a horse.

Horse bit — has part. Metal in the horse’s mouth.
Headband — has part. Straps on the head.
Reins — has part. Control.
Lever — uses. The bit acts as a lever on the jaw.
Leather — is made of. A bridle is leather straps.
Bone — is made of. Early cheekpieces were carved from antler and bone.