UPDATE:
This design was fairly poor, and was done more or less as a proof of concept, an improved design has been made and can be found here:
https://www.thingiverse.com/thing:2503506
This is a handlebar grip mold for a bicycle. You will need to print this mold then fill it with a silicone based material like Smoothon Mold Max.
Bike_Grip_Mold_Bottom.STL | 3.3MB | |
Bike_Grip_Mold_Top.STL | 26.6MB | |
Center_Pin.STL | 351.4KB |