Nosram RS.21 RR 7mm Carburettor
Nosram now offers a fixed 7mm carburettor, specially developed for use with their RS.21 RR Nitro Engine. Designed for simple tuning and competition racing, this carburettor generates a smooth and efficient throttle control, resulting in extremely low fuel consumption that enables you to stretch out your pit stops longer than the competition.
Source: Nosram [nosram.com]