Each bearing is high quality and has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease. * Size A - The A bearing fits most Duncan, Playmaxx, YoYoFactory, ZanNavi and many other yo-yos. Measures 5mm x 10mm x 4mm.* Size B - This bearing fits small bearing YoYoJam yo-yos, including SpinFaktors (but not the HG), Kamaitachi, Sunset Trajectory and Matrixx. It also fits the SuperYo Renegade, and the Spintastics Revolver and Eclipse. Measures .250 x .375 x .125 (1/4" x 3/8" x 1/8").* Size C - Fits the large bearing YoYoJam yo-yos including the Hitman, Lyn Fury, Spinmaster 2 and 3, Big Ben, Patriot, Nightmoves 2 and 3, Shockwave 3 and the Speeder, as well as the YoYoFactory G5 and 888. Measures .250 x .500 x .187 (1/4" x 1/2" x 3/16").* Size D - Fits HSpin and SPYY yo-yos. Measures 5mm x 11mm x 5mm.* Size E - Fits the Spintastics Tornado, Tigershark, Riot, Great White, Comet, Torch, and Firefly, and Yomega ball bearing yo-yos. Measures .156 x .312 x .125 (5/32" x 5/16" x 1/8").* Size G - Fits all Custom yo-yos. Measures .187 x .375 x .125 (3/16" x 3/8" x 1/8").* Size I - Fits all Tom Kuhn ball bearing yo-yos. Measures .125 x .312 x .140*This size chart was developed by infinite illusions and copied from wikipedia.
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