These aftermarket weights fit for: 2019 Odyssey Stroke Lab #9 #7, Stroke Lab Double Wide 35" Putter, Stroke Lab Seven, Stroke Lab R-Ball 34", O-works putter Note: These weights don't fit Odyssey Stroke Lab Marksman putter, two ball OG, two-Ball Fang, R-Ball series putters putter. Precise CNC made, smoother fit to your putter head 1 PAIR in the package, 39g per piece. due to the structure and materials, this is the heaviest gram. The diameter is 0.795''(20.15mm) Precise CNC made high quality aftermarket replacement weights for Callaway Odyssey Stroke Lab series putter head