Decent article that talks some technical details...
https://www.indycar.com/News/2019/10...vin-Aeroscreen
Some select quotes that talk about the halo structure that is the foundation...
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The Aeroscreen has been developed in collaboration with Red Bull Advanced Technologies. The driver safety innovation encompassing the cockpit is comprised of a ballistic Aeroscreen anchored by titanium framework.
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The titanium framework mounts in three areas around the cockpit: the chassis centerline, two rear side mounts and roll hoop integration to provide enhanced load-bearing capabilities.
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It sounds very similar to the F1 halo which also has a titanium core.
Richard