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Silicone O-Ring wheels for 150 g combat robot. New version now 0,5g lighter than older!Wheel outer dia: 27 mmHub dia:24 mmWheel O-ring size: 3 x ID20 mm Food grade siliconeAxels: 3 mm D-ShaftWeight: 0,9g (Hub) / 2,15g (With O-Rings)Remember that different filaments and printing settings gives different hole sizes, so you might have to find your own suitable settings for proper D-shaft sizing.Check out the wheel testing video from my Youtube channel: https://youtu.