the wolverine entry is wrong. the claws are just coated with adamantium like the rest of his skeleton. this is revealed when magneto strips him of all his adamantium in battle and nearly kills him in the process (it took all of jean gray and xavier's power to keep him alive until his healing factor could catch up to all the damage). soon after, an adamantiumless wolverine attempts to deploy his claws for the first time since the incident and they do, made of bone.
Abusive comment hidden.
(Show it anyway.)