Straight Flex Wheel 4"OD x 1" WD, 1-1/8" ID, 40A (fc-217-6451)
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Flex Wheels are made of a super tough custom blend of silicone rubber - different than any other flexible or compliant wheel currently used by FTC or FRC teams. Each of our four wheel diameters are offered in 3 different durometers: the super soft 30A in light gray, the medium hardness 40A in dark gray and the hardest 60A in black. The varying hardnesses can be used to change the traction and compliance of your mechanism.
(picture from West Coast Products)