Every number in this review is one I measured with my own equipment and instruments. Swing weight on a Briffidi SW1, twist weight on a Briffidi TWA2, static weight on a precision balance scale, serve speed and punch volley speed with a radar gun, spin from a high-speed camera at over 500 frames per second, surface roughness with a stylus roughness tester. It's the same setup for all 599 paddles I've measured.
Swing weight 108.3 · Twist weight 6.85 · Spin 2,307 RPM · Static weight 8.03 oz · Serve speed 60.6 MPH · Punch volley speed 38.5 MPH
If a metric is missing above, this paddle hasn't been through that test yet. Full measurements for the J2FC+ 16mm are on its paddle page. My method is written up on the methodology page, and every paddle I've measured is in the paddle data study.
How I test and measure paddles See the full paddle data study