Campagnolo Record / Chorus cassette (or cog set, or sprockets if you prefer), hailing from Italy and in production during the 1990s (yet still new & unused after all this time). Made from steel and weighing in at 281 grams. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike. These date to the back end of the C-Record era, from 1991 to 1993 when the code changed to CS-8RE. The pattern is the original Campagnolo one with equally spaced splines, the sprockets won't fit the later Exa-Drive 8 speed hubs, but they will fit the earlier 7 speed ones. .
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