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The Perfect Pitching set commemorates all the perfect games ever pitched in Japan up until (and including) 1994. BBM put the set out as a response to the perfect game tossed by Hiromi Makihara of the Giants on May 18th of that year. The set features cards for each of the 15 perfect games thrown to that point (there's been one since - Game 5 of last year's Japan Series) along with three extra cards for Makihara. Actually, to be completely honest, there's a card for each game except the one thrown by Tsutomu Tanaka of the Nishitetsu Lions less than two weeks after Sasaki's. Apparently there was an issue getting rights so instead there's a card sized piece of paper with an explanation of why there's no card:
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I'd be much obliged to anyone who could translate this for me.