Is this bag material gas impermeable (specifically to oxygen)?

I think so, when I vacuum seal something with air in it, it stays puffed up until i open it. the air doesn't seem to leak.

What's the mil on these please?

Aloha! These are 4mil. Please inform us if you have any further questions! Thank you! Shield N Seal Sales Team!

What type of plastic are these? Or will they make it through a pressure cooker

Im not sure but they are pretty heavy duty for thickness

Are these bags mylar?

On their website these rolls are listed under the mylar catalog. So it would seem yes

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Description

🔒 Seal the Deal on Freshness!

HEAVY DUTY DESIGN - Crafted from super thick, 5mm commercial-grade plastic for repeated use.
SEAL IN FRESHNESS - Keep your food fresh 5x to 10x longer with our advanced vacuum technology.
LIGHT PROOF STORAGE - One clear side allows visibility, while double-bagging ensures light-proof protection.
SAFE FOR ALL STORAGE - Perfect for stove or freezer use, making it ideal for long-term food storage.
VERSATILE COMPATIBILITY - Compatible with almost any vacuum sealer 11" or larger for ultimate convenience.

ShieldNSeal Vacuum Seal Rolls (Black and Clear, 11" x 19.5') are designed for the modern kitchen, featuring super thick, BPA-free plastic that locks in flavor and freshness. With a heavy-duty 5mm thickness, these rolls are compatible with most vacuum sealers and can keep food fresh for 5 to 10 times longer. Ideal for both short-term and long-term storage, they offer a clear side for easy visibility and can be safely used in the stove or freezer.