hi, i found they gripped well when i was running with a mag, but the,ve disapeared into the big parts box in the sky. i preffer to run no no mag as its more fun so i,m in the process of converting most of my cars to non mag. a few ive left mag to run ghost mode, rubber band on the trigger so ive got some thing to race against.all the questions are because theres a slot car club somewhere near newquay id like to join, mostley to find out how many of the idea,s ive tried on my brass and piano wire chassis work. cheers john