These are several offcuts of aluminum composite material ACM from fallen design. This is 1/8 inch black coated aluminum surface , which can be cut, etched, or laser engraved to reveal bare metal beneath the black. See link for the full product description. This can be useful for electronics projects, sign making, labeling, and other creative uses.
The usual price for this new is $16 per square foot for small pieces - I'm asking $8 per square foot. The whole lot would be approximately $180 - I'm open to offers for any or all of it.
You can see the measurements in inches in the pictures. I have excluded awkward shaped parts or parts with holes or flaws, so the measurements represent the large central section of each piece.
ACM Sign Panel - Black Matte - https://www.falkenacrylic.com/collections/acm-aluminum-composite-sign-panel-sheet/products/acm-sign-panel-black-matte-1-8-inch-thick