IIRC, all of the Sensor/C's had modified three-piece cores, with a pancake at the top, a puck in the center, and a "pedestal" connecting them. As such, I'd think that the closest approximation to this reaction in something current would be in one of the modified three-piece designs, like the Brunswick Power Groove Reactive, Columbia Flipside Wild, Ebonite Tornado, or Storm Big Hit. The nice things about these balls are that they work great on drier heads, and they're cheap.