The outer wheel  is  designed for replacing the original rubber wheel which got sticky, it can also increase  friction. Nylon is recommeded. Not sure if it matches Logitech MX300/MX310, if the original one fits, so does this one.

Usage:  assemble  with the original inner wheel.

Stp files are provided so you can modify them yourselves, such as changing the style of the non-slip stripes.

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