I use to love them, haven't played with them for 35+ years now, had a few metal flake Gold Chapperal Cars & candy red GT40's that were fast as hell, had the soft white rubber tires & custom sprung frames/chassis my step dad made out of brazing rod, custom wound motors, larger brushes... I use to go to a place Buzy Bees in Concord great race track, great cars, great hobby & allot of people back, active in the mid 60's - late 70's, I had a big carry case, I made out of 1/4 plywood, had drawers & a work platform, that carried all my spare parts, in drawers/cubby holes, a section for the bodies, a section for the cars etc..... brings back good/fond memories...