Not much to say! They're grips made out of silicon. They feel quite comfortable, although I can't really tell that they absorb any more shock than good rubber grips.
What do they weigh?
They weigh 59g on my scale. Manufacturer claimed weight is 60g.
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Quick facts:
How to change grips the easy way
Changing a set of grips should take less than 5 minutes and you shouldn't even break a sweat.