M4 Aluminium Serrated Flange Wheel Nuts (no nylon) are lightweight and super easy to take off. 
These Wheel Nuts Have No Nylon Insert, but have a Large Serrated Flange to make your wheels easy to remove and not to come undone mid race.
Features:
Lightweight
Flange/ Serrated 
Suitable for 1/10th off road and and on road