They're standard stamped steel baskets. Small magnets yes, but Jensen's are quite respected. Some command good money...... not as much as an Altec, but still decent. Guitar guys like them, but that tends to be model specific.....as does high value. I've had, and have, various Jensen drivers. Some I've pulled from consoles and some are in standalone cabinets. Since I'm not a guitar player, I sell them if I can. The ones I've had in cabinets I've been less than impressed with....... too bass shy. Even the "Flex-Air" woofers. I'm not sure if it's the cabinets, the drivers, or my expectations. I've had other vintage speakers that I thought sounded better......... in all fairness, I'm not sure that I'm comparing speakers from like decades. My Jensen's are late 50's, but my Ohms, and Wharfedales were likely late 60's...... not quite sure.
I'm rambling........ I guess I like Jensens in part becasue they're an old American company that did well, and produced a lot of good drivers at varying price points. Peter Jensen also designed, or had his hand in, the old Magnavox drivers that I like.
Edit: That basket is known as a Hot Dog basket because of the slots. The blue-ish colored ones usually bring higher $$$'s.






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