Back in the day, not only were these bits of iron the latest gadgets, but they were a means of gaining character. By which, of course, I mean scars. Nowadays you’d be charged with reckless endangerment if you even let a kid try these things on.
The set above is actually for sale, and touchingly, they’re the seller’s actual old pair and come with a book adjuring the reader not to let scraped knees get in the way of rolling glory. I imagine someone has bought them by now, but if you need a nostalgia fix (or just want to show your kid how it used to be), you can probably find a similar pair on eBay.