1.34 inches or 34 mm trackball diameter; Replacement ball for major trackball mice in the market (trackball only) The glossy surface is treated with a special coating to provide a precise and smooth tracking performance The absolute spherical provide fast movements and works perfectly for multiple screen control How to replace trackball for PERIMICE-517/717: the trackball can be easily removed from the bottom hole of the mouse, using the blunt side of a pencil/pen Compatibility: Designed for any trackball mice using 1.34 (34mm) trackball size; Such as from Perixx: PERIMICE-517/717, Logitech: MX Ergo, M570, Cordless, Kensington: TrackMan Wheel (not include Trackman Marble), Elecom: M-XT3DRBK (EX-6), M-DT2URBK, EX-G/DEFT Sanwa: MA-WTB43BK
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