From the collection of Carlo Greco, Master Luthier:

Eleven ebony bridge saddles.  These appear to be part of the bridge for acoustic archtop guitars, perhaps for certain Guild models.

Approx. dimensions:
Length: 2-5/8" to 2-21/32"
Width: 9/32" to 13/32"
Thickness: 3/8"

Please contact me if you have any questions.

PLEASE NOTE: I am shipping via FedEx within the United States.

Thank you.