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This is a pair of performance intake + exhaust camshafts from last gen Kawasaki KLX300R (2020+). These are different from all KLX250/KLX300 and old gen KLX300R, but could be used as drop-in replacement.
Compared to KLX250/KLX300 cams, these cams have wider duration and slightly lower max lift. As a result they offer extra hp (5-10%) at the top of the RPM range. See my video review here -