Those above are better than the spring type bullets like these -

http://www3.towerhobbies.com/cgi-bin...?&I=LXJPY4&P=M


the spring wears and will eventually break...



I use the Duratrax ones, but only if I need to turn the wire to the side which these bullets are designed to do. Otherwise I use Castle bullets -

http://www3.towerhobbies.com/cgi-bin...&I=LXTJH8&P=ML