Oster
Specs partially disclosed oster.com ↗
Not a plastic-free brand, but a legacy holdout worth knowing about: Oster still sells classic blenders with a real glass jar and an all-metal drive when most competitors have gone all-plastic. The blend path is glass, a stainless blade, and a rubber sealing ring, with the plastic confined to the lid - so the food-contact surfaces are largely plastic-free even though the brand doesn't market it that way. It's a "minimal-contact" pick, not a purist one; the plastic lid keeps it from a clean rating.
How clear are their specs?
Names the glass jar (branded "Boroclass") and all-metal drive, but is typical mass-market about the lid and gasket materials, which you have to infer rather than read off a spec sheet.
