CNC milled "quick action" throttle control from TNT.
Having a larger pulley simply makes a shorter stroke required to go from 0% throttle to wide open 100% throttle position, meaning less twist of the wrist is needed to hit the gas all the way.
TNT manufactures wide range of body, engine and other parts. They specialize in motorcycle, scooter and moped parts. Many TNT products are universal parts and therefore suitable for all vehicles.