Due to some of the surviving lifebelts being untied from survivors or cut loose from the victims' bodies, there are also some half or fragmented lifebelts known to exist. You can read about what is known of them here.

Cork from John Jacob Astor's lifebelt

Cork fragments from Madeleine Astor's lifebelt

Cork from lifebelt saved by Carpathia passenger Louis Ogden

Corkblock also saved by Carpathia passenger Louis Ogden 

Lifebelt fragment in the Miottell Museum Collection 

Lifebelt fragments in Steve Santini's collection

Lifebelt fragment in Christie Seyglinski's collection

Unauthenticated lifebelt fragments

video of a replica lifebelt floating on the water by Steven Proto - 2023.