Bangles

Bangles:
The image features bangles, some of which are engraved with the "Cartier" logo, resembling the iconic Cartier Love bracelet design. These bangles are plain, round, and feature a clasp mechanism with two spherical elements.
Rings:
Also visible are simple, plain bands, potentially rings, in various metallic finishes. 
Material:
Metallic Composition:
The bracelets appear to be made of a metallic material, likely an alloy, given the varied finishes. Search results indicate that similar items are often gold-plated alloy. 
Finishes:
The items are presented in different metallic finishes, including what appears to be rose gold, silver-toned, and gold-toned finishes. 
Finishing:
Engraving:
The bangles clearly show engraved text, specifically the "Cartier" brand name, indicating a detailed finishing process. 
Polished Surface:
The smooth and reflective surface of the bracelets suggests a polished finishing, enhancing their aesthetic appeal.